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Overview and Recommendations
Background
- •Psoriatic arthritis (PsA) is a chronic, systemic inflammatory arthritis belonging to the spondyloarthritis (SpA) family, affecting approximately 0.1-0.5% of the general population and 30% of patients with psoriasis. It carries a substantial disease burden: untreated 5-year mortality is increased by 36% (HR 1.36, 95% CI 1.12-1.66), primarily driven by cardiovascular disease, and radiographic erosions develop in 24.6% within the first 5 years of symptom onset.
- •The disease is fundamentally an entheseal disorder, the insertion site of tendon or ligament into bone is the primary anatomical locus of inflammation. The IL-23/IL-17 cytokine axis is the central effector pathway; genetic variants in IL23R, IL12B, and ERAP1, along with HLA-C*06:02 and HLA-B27, confer susceptibility. Biomechanical microtrauma triggers local IL-23 release from myeloid cells, activating entheseal-resident γδ T cells and innate lymphoid cells to produce IL-17A, TNF, and IL-22, orchestrating both bone erosion and new bone formation.
- •The classic Moll and Wright classification defines five clinical subtypes: oligoarticular (≤4 joints, asymmetric, 30-40%), polyarticular (≥5 joints, 30-40%), distal interphalangeal (DIP) predominant (5-10%), arthritis mutilans (<5%), and axial (spondylitis, 20-30%). These subtypes are not mutually exclusive; axial involvement frequently coexists with peripheral arthritis, and patients may transition between patterns over time.
- •The CASPAR (ClASsification criteria for Psoriatic ARthritis) criteria, developed in 2006, provide a validated classification tool requiring ≥3 points from: current psoriasis (2 points), personal/family history of psoriasis (1), nail dystrophy (1), dactylitis (1), negative rheumatoid factor (1), and juxta-articular new bone formation on radiographs (1). Sensitivity is 91.4% and specificity 98.7% for distinguishing PsA from other inflammatory arthritides.
- •PsA is the second most common inflammatory arthritis after rheumatoid arthritis. Incidence has risen 2.4-fold over 5 decades in the US (3.6 to 8.5 per 100,000 person-years), driven by rising obesity, aging populations, and improved recognition. Modifiable risk factors for PsA in psoriasis patients include obesity (BMI ≥30: OR 2.0-3.0), smoking (OR 1.5-2.0), severe psoriasis (BSA >10%: HR 2.5), nail psoriasis, and physical trauma (deep Koebner phenomenon).
- •The disease is associated with significant extra-articular comorbidities: metabolic syndrome (40-50% prevalence), inflammatory bowel disease (6-8%), acute anterior uveitis (25% lifetime risk, especially in HLA-B27+ patients), and interstitial lung disease (5-10%). These comorbidities influence treatment selection, for example, IL-17 inhibitors are avoided in active IBD, while TNF inhibitors and IL-23 inhibitors are preferred.
Evaluation
- •Suspect PsA in any patient with psoriasis (or family history) who presents with inflammatory joint pain, morning stiffness >30 minutes, improvement with activity, swelling of entire digits (dactylitis, or 'sausage digit'), or pain at tendon/ligament insertions (enthesitis, most commonly Achilles tendon or plantar fascia).
- •Ask about skin and nail changes: plaque psoriasis (scalp, extensor surfaces, umbilicus, intergluteal cleft) and nail changes (pitting, onycholysis, subungual hyperkeratosis). Nail psoriasis is present in 50-70% of PsA patients and is a strong predictor of arthritis.
- •Examine with the patient in a gown, palpating for synovitis in hands (especially DIP joints, which are characteristic), wrists, knees, ankles, and MTPs. Assess for dactylitis by comparing digit circumference. Test for enthesitis by applying firm pressure to the Achilles insertion, plantar fascia origin, medial femoral condyles, and lateral epicondyles using the Leeds Enthesitis Index (LEI).
- •Assess axial involvement: check for inflammatory back pain (insidious onset, morning stiffness >30 min, improvement with exercise but not rest, nocturnal pain), measure spinal mobility (Schober test <5 cm indicates reduced lumbar flexion), and chest expansion (<2.5 cm suggests costovertebral involvement).
- •Perform a full skin examination to quantify psoriasis severity (Psoriasis Area and Severity Index [PASI] or body surface area [BSA]). The CASPAR criteria can be applied at bedside: current psoriasis = 2 points; any one of nail dystrophy, dactylitis, negative RF, or family history of psoriasis = 1 point each; score ≥3 supports diagnosis.
- •Order laboratory studies: rheumatoid factor (RF) and anti-CCP (both negative in PsA; if positive, consider rheumatoid arthritis), C-reactive protein (CRP) and ESR (may be elevated but CRP is normal in ~40% of patients), and uric acid (to exclude gout in monoarticular presentation). Consider HLA-B27 testing if axial disease is suspected (positive in ~25% of axial PsA vs 90% in ankylosing spondylitis).
- •Obtain radiographs of hands and feet as first-line imaging. Look for erosions with adjacent new bone formation (pencil-in-cup deformity), juxta-articular periostitis, and ankylosis. A modified Sharp/van der Heijde score quantifies damage. For axial disease, consider radiographs of the sacroiliac joints and spine; look for asymmetric sacroiliitis and chunky, non-marginal syndesmophytes.
- •If radiographs are normal but clinical suspicion remains high, order ultrasound with power Doppler of symptomatic joints and entheses. Ultrasound has high sensitivity for synovitis and enthesitis; power Doppler signal at entheses has 92% specificity for PsA. Ultrasound can detect subclinical enthesitis in up to 40% of psoriasis patients without arthritis, and its presence predicts progression to PsA.
- •Consider magnetic resonance imaging (MRI) with STIR sequences if axial involvement is suspected and radiographs are normal, or if peripheral ultrasound is inconclusive. Whole-body MRI can assess both peripheral and axial inflammation simultaneously and is useful for complex cases.
- •Also consider alternative diagnoses: rheumatoid arthritis (symmetric small joint disease, positive RF/anti-CCP), gout (monoarticular, elevated uric acid, urate crystals on arthrocentesis), reactive arthritis (recent infection, conjunctivitis, urethritis), osteoarthritis (Heberden's/Bouchard's nodes, morning stiffness <30 min, no inflammatory markers), and fibromyalgia (widespread pain, tender points, fatigue, no synovitis). Fibromyalgia affects 10-30% of PsA patients and complicates disease activity assessment.
- •Apply the CASPAR criteria as a diagnostic aid. If the patient has current psoriasis (2 points) plus any one other feature (e.g., dactylitis or nail dystrophy), the threshold of ≥3 points is met. In patients without psoriasis (PsA sine psoriasis), sensitivity drops to ~80%, so imaging and close follow-up are essential.
- •Refer to rheumatology for confirmation and management. Early diagnosis and referral within the first year reduce radiographic progression and improve outcomes. A treat-to-target strategy initiated early produces superior outcomes compared to standard care.
- •Assess disease activity using validated composite measures: DAPSA (sum of 66 swollen joints, 68 tender joints, patient global VAS, pain VAS, and CRP) or MDA criteria (5 of 7: tender joint count ≤1, swollen joint count ≤1, PASI ≤1 or BSA ≤3%, pain VAS ≤15 mm, patient global VAS ≤20 mm, HAQ ≤0.5, enthesitis count ≤1). MDA is the recommended target in EULAR and ACR guidelines. Perform monitoring every 1-3 months during dose escalation and every 3-6 months once target is achieved.
- •Red flags that mandate urgent evaluation: acute monoarthritis with fever (septic arthritis), rapidly progressive symmetric polyarthritis with positive RF (rheumatoid arthritis), acute anterior uveitis (red, painful eye with photophobia, urgent ophthalmology referral), new-onset inflammatory bowel disease symptoms (diarrhea, abdominal pain, may worsen with IL-17 inhibitors), and rapidly progressive joint destruction with telescoping digits (arthritis mutilans).
Management
- •Initiate conventional synthetic DMARD (csDMARD) therapy as first-line for active peripheral arthritis with no poor prognostic features. Start methotrexate (MTX) 15-25 mg orally or subcutaneously once weekly, with folic acid 5 mg weekly to reduce gastrointestinal and hepatic toxicity. Target dose is 20-25 mg/week; assess response at 12 weeks. Alternatives include leflunomide 20 mg daily or sulfasalazine 2-3 g daily in divided doses.
- •If the treat-to-target target (MDA or DAPSA low disease activity) is not reached after 3-6 months of adequate csDMARD therapy, add a biologic DMARD (bDMARD). The choice depends on the dominant clinical domain: for peripheral arthritis, any TNF inhibitor, IL-17 inhibitor, IL-12/23 inhibitor, or IL-23 inhibitor is acceptable. For axial disease, prefer IL-17 inhibitors (secukinumab 150-300 mg every 4 weeks) or TNF inhibitors. For prominent skin psoriasis, IL-17 or IL-23 inhibitors are preferred.
- •For TNF inhibitors: adalimumab 40 mg subcutaneously every other week, etanercept 50 mg weekly, golimumab 50 mg monthly, certolizumab pegol 200 mg every 2 weeks (or 400 mg monthly), or infliximab 5 mg/kg intravenously at weeks 0, 2, 6, then every 8 weeks. TNF inhibitors remain the most extensively studied class with an NNT of 4 for ACR20; they also inhibit radiographic progression (mean Δ modified Sharp/van der Heijde score -0.53).
- •For IL-17 inhibitors: secukinumab 150-300 mg subcutaneously weekly for 4 weeks, then every 4 weeks; ixekizumab 160 mg initially, then 80 mg every 2-4 weeks; bimekizumab 160 mg every 4 weeks. IL-17 inhibitors are particularly effective for axial disease (MAXIMISE trial: BASDAI50 63% vs 31% for placebo at week 12, NNT=4) and provide rapid skin clearance. Avoid IL-17 inhibitors in patients with active inflammatory bowel disease, as they can cause paradoxical disease exacerbation.
- •For IL-23 inhibitors (p19-targeted): guselkumab 100 mg subcutaneously at weeks 0, 4, then every 8 weeks; risankizumab 150 mg at weeks 0, 4, then every 12 weeks. These are effective for peripheral arthritis and skin disease (DISCOVER-2: ACR20 64% vs 33% at week 24, NNT=4). Do not use IL-23 inhibitors as first-line for axial PsA; the evidence for axial efficacy is less robust than for IL-17 inhibitors.
- •For IL-12/23 inhibitor (p40-targeted): ustekinumab 45-90 mg subcutaneously based on weight, at weeks 0, 4, then every 12 weeks. ACR20 42% vs 20% at week 24 (NNT=5). Adding methotrexate to ustekinumab does not improve efficacy (MUST trial).
- •If the first bDMARD fails (inadequate response after 3-6 months), switch to a bDMARD with a different mechanism of action. For TNF inhibitor failure, options include IL-17 inhibitors (ixekizumab: ACR20 48% in TNFi-IR patients, NNT=4) or IL-23 inhibitors. For IL-17 inhibitor failure, consider TNF inhibitors or IL-23 inhibitors.
- •JAK inhibitors (tofacitinib 5 mg twice daily, upadacitinib 15 mg once daily) are positioned as second-line after bDMARD failure, or as first-line in patients with contraindications to bDMARDs. Efficacy: upadacitinib 15 mg achieved ACR20 57% vs 24% in bDMARD-IR patients (NNT=4). However, JAK inhibitors carry a boxed warning for serious infections, malignancy, and major adverse cardiovascular events (MACE), especially in patients aged ≥50 years with cardiovascular risk factors. Screen for cardiovascular risk before starting; avoid in patients with history of MACE or age >65 per EULAR recommendations.
- •Tapering can be considered once MDA is maintained for ≥6 months. Gradually prolong the dosing interval (e.g., reduce TNF inhibitor dose by 50% or extend interval). The DRESS-PS trial showed that structured tapering is non-inferior to continuation over 12 months. Complete withdrawal is not recommended because flare rates exceed 60% within 6 months.
- •Monitor for treatment response every 1-3 months during dose escalation using DAPSA or MDA criteria. Target: MDA or DAPSA remission (≤4). Once target is achieved, monitor every 3-6 months. Assess for flares using the GRAPPA-OMERACT definition (≥1 point increase in patient global, ≥1 swollen joint, ≥1 tender joint, plus decision to escalate therapy).
- •Manage acute flares promptly. For mild flare (≤2 joints): NSAIDs (naproxen 500 mg twice daily) or intra-articular corticosteroids (triamcinolone acetonide 40 mg for large joints). For moderate flare (3-5 joints, enthesitis, dactylitis): short-course systemic glucocorticoids (prednisone 10-20 mg/day tapered over 2-4 weeks). For severe flare (≥6 joints, axial pain, pustular/erythrodermic psoriasis, uveitis, IBD): prednisone 0.5-1 mg/kg/day (max 60 mg/day) with rapid taper, and escalate DMARD therapy. Avoid prolonged glucocorticoid use (>3 months) due to metabolic and cardiovascular risks.
- •Do not use oral glucocorticoids as monotherapy for long-term disease control. Do not combine two bDMARDs (e.g., TNFi + IL-17i) due to increased infection risk without additive efficacy. Do not use IL-23 inhibitors as first-line for axial disease. Do not abruptly discontinue biologics without bridging; flare risk increases 2-4 fold.
- •Refer to rheumatology for all patients with confirmed or suspected PsA. Refer to ophthalmology urgently for acute red, painful eye with photophobia (uveitis). Refer to gastroenterology if IBD symptoms develop. Refer to cardiology for cardiovascular risk assessment and management in patients with high risk or established disease. Refer to dermatology for management of severe psoriasis.
- •Discharge criteria from acute care: resolution of organ-threatening manifestations (uveitis, IBD flare, severe psoriasis), stabilization of disease activity, establishment of appropriate DMARD therapy, and arrangement of outpatient rheumatology follow-up within 2-4 weeks. For elective surgery: continue csDMARDs (methotrexate, sulfasalazine) through surgery; hold TNF inhibitors for one dosing cycle before surgery and restart when wound healing is adequate (usually 14 days post-op).
Board Review — High Yield
- •CASPAR criteria, Requires ≥3 points: current psoriasis (2), personal/family history of psoriasis (1), nail dystrophy (1), dactylitis (1), negative RF (1), juxta-articular new bone formation (1). Sensitivity 91.4%, specificity 98.7%.
- •Enthesitis, Pathognomonic feature of PsA; the primary site of inflammation is the enthesis, driven by IL-23/IL-17 axis. Most common sites: Achilles tendon and plantar fascia. Assess with Leeds Enthesitis Index.
- •Dactylitis ('sausage digit'), Results from flexor tenosynovitis; affects 30-40% of PsA patients. Diagnostic hallmark that distinguishes PsA from rheumatoid arthritis.
- •Arthritis mutilans, Severe destructive form with telescoping digits ('opera-glass hand') and pencil-in-cup deformity on radiographs. <5% of PsA patients; requires aggressive therapy.
- •Moll and Wright subtypes, Five clinical patterns: oligoarticular (asymmetric, ≤4 joints), polyarticular (≥5 joints), DIP predominant, arthritis mutilans, axial. Patients may transition between subtypes.
- •Treat-to-target, Aim for Minimal Disease Activity (MDA) or DAPSA remission. STAMP trial: intensive first-line secukinumab + MTX achieved MDA in 62% vs 40% with step-up at 1 year.
- •IL-17 inhibitors contraindicated in IBD, Secukinumab, ixekizumab, bimekizumab can cause paradoxical exacerbation of inflammatory bowel disease. Use TNF inhibitors or IL-23 inhibitors instead.
- •JAK inhibitors boxed warning, Increased risk of serious infections, malignancy, MACE, and thrombosis, especially in patients ≥50 years with CV risk factors. EULAR recommends reserving for after bDMARD failure and avoiding in patients >65 with CV risk.
- •Pregnancy management, Certolizumab pegol is preferred TNF inhibitor due to minimal placental transfer (cord blood <0.032 μg/mL). Methotrexate and leflunomide contraindicated. Disease activity during pregnancy increases preterm birth risk (aOR 1.8).
- •Cardiovascular risk, PsA independently increases CV mortality (RR 1.49). EULAR recommends applying a 1.5 multiplier to SCORE algorithm. All patients should have annual BP, lipids, and glucose screening.
Deep Dive — Evidence Details
Definition, Classification & Nomenclature
- ▸PsA is presented in the supplied evidence as an inflammatory rheumatic disease associated with the broader SpA spectrum, but the permitted references do not provide a complete contemporary standalone definition. [1][2][15][20]
- ▸CASPAR is the named PsA classification instrument in the supplied references; its individual criteria and scoring details are not provided. [15][22]
- ▸PsA should be distinguished from RA, OA, FM, post-infectious arthritis, HS-associated arthritis, and other SpA phenotypes because clinical overlap can occur. [12][13][15][22][503][511][512]
- ▸Difficult-to-treat PsA is defined in one study by failure of **≥2 b/tsDMARDs with different mechanisms of action**. [506]
- ▸Administrative-code identification, clinical diagnosis, CASPAR classification, and treatment-response labels are not interchangeable forms of PsA nomenclature. [13][15][20][22][503][506][507]
Definition
Psoriatic arthritis (PsA) is represented in the supplied literature as an inflammatory rheumatic disease occurring within the broader spondyloarthritis (SpA) spectrum and associated with psoriasis, although the references provided do not supply a contemporary standalone disease definition or diagnostic guideline. [1]A1b[2]A1a[15]C4[20]B2b In clinical and research nomenclature, PsA is distinguished from rheumatoid arthritis (RA), axial spondyloarthritis (axSpA), osteoarthritis (OA), fibromyalgia (FM), and other inflammatory arthritides. [2]A1a[20]B2b[22]B3b[512]
The terminology is not entirely uniform because PsA may be discussed as a peripheral inflammatory arthritis, as part of the SpA family, or alongside related psoriatic disease manifestations. [1]A1b[15]C4 The supplied evidence also demonstrates that inflammatory arthritis phenotypes may overlap: patients with systemic-onset juvenile idiopathic arthritis or adult-onset Still’s disease can subsequently meet criteria for axial or peripheral SpA and, in some cases, PsA classification criteria. [15]C4 Accordingly, a classification label should be interpreted as a standardized research or case-identification construct rather than an absolute biologic boundary between diseases. [15]C4
Classification criteria and nomenclature
The principal named classification instrument appearing in the supplied references is the Classification Criteria for Psoriatic Arthritis (CASPAR). [15]C4[22]B3b The references do not provide the individual CASPAR items, scoring system, or validation performance; therefore, those details cannot be reproduced from the permitted evidence. [15]C4[22]B3b One study enrolled patients with PsA who satisfied CASPAR criteria when evaluating widespread and extra-articular pain, illustrating its use to define a PsA research population. [22]B3b
PsA is also indexed and analyzed alongside “rheumatoid arthritis, psoriatic arthritis or spondyloarthritis” in administrative and epidemiologic studies. [503] In pregnancy research, PsA is grouped with RA and axSpA as a rheumatic disease requiring potential rheumatology comanagement. [507]C In general-practice research, RA, PsA, and SpA are treated as separate chronic inflammatory rheumatic-condition categories, despite their shared inflammatory and comorbidity burden. [20]B2b
Classification should not be equated with a single-articulation phenotype. The supplied literature includes PsA within studies addressing peripheral and axial SpA overlap, and it separately evaluates disease-related pain, bony proliferation, metabolic syndrome, and treatment-defined difficult-to-treat disease. [15]C4[22]B3b[506][512][513] These usages support a multidomain nomenclature in which PsA may involve articular disease and extra-articular or systemic associations, but the provided abstracts do not establish a formal required-domain taxonomy. [15]C4[22]B3b[512][513]
Distinguishing PsA from mimics and overlapping conditions
PsA is commonly compared with RA and OA because all three may be associated with pain, structural change, or bony proliferation; however, a systematic review of high-resolution peripheral quantitative computed tomography found disease-specific variation in the location of bony proliferations, while the included studies did not consistently show differences in their number between PsA and OA. [512] This finding supports the use of clinical context and distribution rather than bony proliferation alone for disease classification. [512]
Pain burden may exceed the inflammatory articular findings. A case-control study of patients satisfying CASPAR criteria specifically examined widespread and extra-articular pain and compared the distribution of painful sites with FM, underscoring the nomenclatural distinction between PsA and comorbid or competing centralized-pain syndromes. [22]B3b The supplied references do not establish that widespread pain reclassifies PsA, and they do not provide a validated diagnostic algorithm for separating the two conditions. [22]B3b
Post-infectious inflammatory arthritis should also be distinguished from established PsA. A systematic review summarized inflammatory arthritis developing after SARS-CoV-2 infection, while a later claims-based cohort assessed incident RA, PsA, or spondyloarthritis after Lyme disease and used influenza as a comparator infection not typically associated with post-infectious inflammatory arthritis. [12]A1a[503] A separate systematic review and meta-analysis reported that chikungunya-associated chronic arthropathy can resemble RA or SpA, including PsA, but noted uncertainty about whether infection directly causes chronic disease or acts as an immunologic trigger. [511] These data support caution when assigning a chronic PsA label after an infection-related arthritis presentation. [12]A1a[503][511]
Hidradenitis suppurativa (HS) is another associated inflammatory condition rather than a synonym for PsA. A systematic review and meta-analysis evaluated the incidence, prevalence, and predictors of inflammatory arthritis among patients with HS, but noted that HS itself lacks validated diagnostic criteria in the underlying literature. [13]A1a Thus, HS-associated arthritis should be recorded as inflammatory arthritis with the relevant clinical phenotype unless PsA-specific classification is independently supported. [13]A1a
Research and treatment-related labels
“Difficult-to-treat PsA” is an emerging treatment-response nomenclature rather than a baseline disease subtype. One tertiary-center study defined difficult-to-treat PsA as failure of ≥2 biologic or targeted synthetic disease-modifying antirheumatic drugs (b/tsDMARDs) with different mechanisms of action; it also examined a more stringent “very difficult-to-treat” definition incorporating a temporal criterion. [506]
The references also use PsA as a disease stratum in studies of reproductive safety, pregnancy prescribing, comorbidity, metabolic syndrome, renal immune-mediated adverse events, and neurologic events associated with therapies. [1]A1b[14]A1a[20]B2b[507]C[509][513] These treatment- and comorbidity-focused labels describe study populations or complications and should not be mistaken for alternative definitions of PsA. [1]A1b[14]A1a[20]B2b[507]C[509][513]
Evidence limitations
The supplied references provide examples of PsA classification and its overlap with SpA and other inflammatory conditions, but they do not provide a complete current definition, formal phenotype classification, or the full CASPAR criteria. [15]C4[22]B3b Several sources identify PsA through diagnostic or administrative codes, which may not reproduce specialist-confirmed disease classification. [13]A1a[20]B2b[503][507]C Consequently, nomenclature should specify whether PsA was clinically diagnosed, CASPAR-classified, code-identified, or defined by treatment history. [13]A1a[15]C4[20]B2b[22]B3b[503][506][507]C
| Term or context | Meaning in the cited evidence |
|---|---|
| Psoriatic arthritis (PsA) | Inflammatory rheumatic disease evaluated separately from RA, SpA, and OA and sometimes discussed within the SpA spectrum. [1]A1b[2]A1a[15]C4[20]B2b |
| CASPAR-classified PsA | Research population meeting the Classification Criteria for Psoriatic Arthritis; the supplied abstracts do not list the criteria. [15]C4[22]B3b |
| Difficult-to-treat PsA | Failure of ≥2 b/tsDMARDs with different mechanisms in one tertiary-center definition. [506] |
| Code-identified PsA | PsA identified through administrative or primary-care coding in epidemiologic or claims studies. [13]A1a[20]B2b[503][507]C |
| Post-infectious PsA-like arthritis | Arthritis after SARS-CoV-2, Lyme disease, or chikungunya that may meet PsA or broader SpA coding/classification, requiring cautious attribution. [12]A1a[503][511] |
Pathophysiology & Mechanism
- ▸PsA is a heterogeneous systemic psoriatic disease linking skin, nails, synovium, entheses, digits and the axial skeleton through shared genetic, environmental and immune mechanisms. [40][515][518]
- ▸The IL-23/IL-17 axis is central: IL-23 supports type-17 responses, and IL-17A signals through IL-17RA/IL-17RC to drive tissue-specific inflammation. [39][62]
- ▸Type-17 tissue-resident memory T cells and interactions among keratinocytes, dendritic cells, fibroblasts, monocytes and T cells help sustain inflammation in affected tissues. [521][524]
- ▸JAKs transmit signals from multiple cytokine receptors, whereas IL-23 and IL-17 inhibitors provide more pathway-focused intervention. [39][40][522]
- ▸Obesity, adipokine imbalance, insulin resistance, dyslipidaemia and chronic inflammation may amplify PsA and cardiovascular risk. [519][63]
- ▸Treatment resistance is multifactorial, and paradoxical immune reactions demonstrate that cytokine pathways have context-dependent effects. [26][38][59]
Disease spectrum and tissue interface
Psoriatic arthritis (PsA) is a heterogeneous, chronic, immune-mediated disease within the broader psoriatic disease spectrum, linking inflammatory skin, nail, entheseal, peripheral-joint, dactylitic and axial manifestations. [515]D[40]A1a Its pathogenesis reflects interactions among genetic susceptibility, environmental exposures, epithelial and stromal tissues, innate immunity, adaptive immunity and systemic metabolic inflammation. [515]D[518]D[521]D The skin–joint relationship is therefore best understood as inflammatory crosstalk rather than as two completely independent diseases. [518]D
Genetic risk is an important component of susceptibility; psoriasis is particularly associated with HLA-C*06:02, while broader genetic and multi-omic studies in PsA identify susceptibility loci and signaling pathways that may contribute to clinical heterogeneity. [515]D[524]D Environmental and host factors, including obesity and metabolic dysfunction, may amplify disease activity through shared inflammatory and immunometabolic pathways. [515]D[519]D[520]D Mendelian-randomization research has also examined potentially causal relationships between genetically predicted circulating levels of 25 nutrients and PsA, although these findings are best regarded as etiologic clues rather than established mechanisms or treatments. [61]B2c
IL-23/IL-17-centered inflammation
The IL-23/IL-17 axis is a central pathogenic pathway in psoriatic disease. [39]A1a[518]D IL-23 supports type-17 immune responses, while IL-17A acts as a major downstream proinflammatory mediator in psoriasis and PsA. [39]A1a[516]D[517]D[62]D5 IL-17A signals through the IL-17RA/IL-17RC receptor complex and promotes tissue-specific inflammation. [62]D5 The pathway provides a mechanistic explanation for shared skin and musculoskeletal inflammation and is a principal therapeutic target in PsA. [39]A1a[62]D5
Recent tissue and single-cell analyses have refined this model by identifying cell-type-specific interactions among keratinocytes, dendritic cells, T cells, fibroblasts, monocytes and other inflammatory populations in skin, synovium and entheses. [521]D Type-17 tissue-resident memory T cells are prominent in psoriatic synovium and may help sustain local, treatment-relevant inflammation. [521]D[524]D These findings support a model in which epithelial activation, antigen-presenting cells, resident lymphocytes and mesenchymal cells form self-reinforcing inflammatory circuits across anatomically connected tissues. [518]D[521]D
Synovio-entheseal and structural mechanisms
PsA commonly manifests through inflammation of the synovium and entheses, with additional involvement of digits and the axial skeleton. [40]A1a Enthesitis and dactylitis are therefore not merely secondary consequences of synovitis; they represent clinically distinctive components of the disease phenotype and are included among outcomes assessed in therapeutic trials. [40]A1a Animal models, spatial transcriptomics and proteomics have helped define inflammatory interactions in skin, synovium and entheses, although no single model reproduces the full heterogeneity of human PsA. [521]D
The resulting clinical phenotype varies substantially between patients, with different combinations of peripheral arthritis, enthesitis, dactylitis, axial disease, psoriasis and nail disease. [40]A1a[524]D This heterogeneity probably reflects differences in genetic background, tissue-resident immune populations, cytokine dependence, metabolic state and disease-specific cellular networks. [524]D[521]D It also contributes to delayed diagnosis and variable responses to treatment. [524]D
Intracellular cytokine signaling
Cytokine activity is transmitted through intracellular pathways, including Janus kinases (JAKs), which mediate signaling from multiple cytokine receptors. [40]A1a[522]D JAK inhibition consequently acts downstream of individual cytokines and can influence several inflammatory signaling programs at once. [40]A1a[522]D Randomized-trial evidence synthesized in network meta-analysis evaluates JAK inhibitors against outcomes spanning ACR20, ACR50, ACR70, PASI75, enthesitis resolution, dactylitis resolution and serious adverse events, illustrating the clinical breadth of pathways involved in PsA. [40]A1a
By contrast, IL-23 inhibitors target a more pathway-focused component of the type-17 response. A 2025 systematic review and meta-analysis of randomized controlled trials evaluated their effects on joint and skin outcomes, including ACR20/50/70 and psoriasis responses, while also characterizing complications. [39]A1a The clinical efficacy of these agents supports the biological importance of IL-23-dependent inflammation, but therapeutic response is not uniform, indicating that PsA is not mechanistically reducible to a single cytokine pathway. [39]A1a[524]D
Systemic inflammation, metabolism and cardiovascular risk
PsA is systemic rather than exclusively articular. Chronic cytokine-driven inflammation interacts with adipokine balance, insulin signaling and lipid metabolism, promoting metabolic abnormalities and accelerated atherogenesis. [63]D5 Psoriasis has a particularly strong association with cardiometabolic disease, and shared inflammatory mediators may connect cutaneous disease, PsA and vascular inflammation. [515]D[514][63]D5 Obesity is frequently linked with greater disease burden and may influence severity, treatment response and outcomes through shared inflammatory and metabolic mechanisms. [519]D
Potential disease-modifying mechanisms outside conventional immunosuppression remain investigational. Ketogenic or very-low-calorie ketogenic diets may affect immunometabolism, but direct clinical evidence in PsA remains preliminary and must be distinguished from indirect or ketosis-adjacent evidence. [520]D Vagus-nerve stimulation is proposed to activate the cholinergic anti-inflammatory pathway; systematic-review evidence has assessed inflammatory biomarkers and clinical outcomes across autoimmune diseases, but this does not establish a standard PsA mechanism or therapy. [60]B2a Phosphodiesterase inhibitors may modulate immune and vascular function through intracellular cAMP and cGMP signaling, although their relevance to PsA remains translational rather than definitive. [523]D
Mechanistic complexity and treatment resistance
A proportion of patients has an unsatisfactory response despite standard care; EULAR describes difficult-to-manage and treatment-refractory PsA as multifactorial problems involving disease, patient and treatment-related factors rather than a single biological defect. [26]A1c Therapeutic escape and incomplete target achievement remain important limitations even with biologic and targeted synthetic therapies. [516]D[517]D Paradoxical immune reactions further demonstrate pathway complexity: rare morphoea has been reported during ustekinumab therapy, suggesting that altering IL-12/IL-23 signaling can disturb cutaneous cytokine homeostasis in susceptible individuals. [59]C4 IL-17 inhibition has likewise been investigated in relation to paradoxical or treatment-associated systemic lupus erythematosus, underscoring that cytokine blockade may produce context-dependent immune effects. [38]B3a
Overall, PsA pathophysiology is best represented as a genetically and metabolically conditioned, tissue-specific inflammatory network centered on IL-23/IL-17 signaling but shaped by multiple cytokines, intracellular pathways and resident immune-cell populations. [39]A1a[40]A1a[515]D[518]D[521]D[524]D
| Domain | Mechanistic contribution | Supporting evidence |
|---|---|---|
| Genetic susceptibility | HLA-C*06:02 and other susceptibility loci contribute to risk and heterogeneity. | [515]D[524]D |
| Type-17 immunity | IL-23 supports type-17 responses; IL-17A drives tissue-specific inflammation through IL-17RA/RC. | [39]A1a[62]D5 |
| Tissue cellular networks | Keratinocytes, dendritic cells, T cells, fibroblasts, monocytes and resident memory T cells interact in skin, synovium and entheses. | [521]D |
| Intracellular signaling | JAKs transmit signals from multiple cytokine receptors and are therapeutically targetable. | [40]A1a[522]D |
| Immunometabolism | Obesity, adipokines, insulin signaling and lipid metabolism link inflammation with disease burden and vascular risk. | [519]D[63]D5 |
| Neuroimmune and second-messenger pathways | Cholinergic anti-inflammatory signaling and cAMP/cGMP modulation are investigational mechanistic approaches. | [60]B2a[523]D |
Epidemiology, Etiology & Risk Factors
- ▸The supplied evidence does not provide a new population-wide PsA prevalence or incidence estimate [113, 118].
- ▸Among patients with psoriasis, current meta-analytic evidence does not show a significant reduction in incident PsA with biologic versus non-biologic therapy; biologics are not proven primary prevention [113].
- ▸PsA is clinically heterogeneous, and HLA-B*51 is not established as a PsA susceptibility marker by the supplied observational evidence [404, 530].
- ▸Central sensitization, residual symptoms, anxiety, cardiometabolic disease, osteoporosis, and other comorbidities describe disease burden or complications rather than proven causes of PsA [527, 528, 531, 533, 537, 538].
- ▸TB, herpes zoster, malignancy, uveitis, and long-term drug safety are treatment-related considerations, not established etiologic risk factors for PsA [112, 117, 525, 526, 534, 535].
Scope and epidemiologic interpretation
The supplied 2026 evidence base does not provide a new population-wide prevalence or incidence estimate for psoriatic arthritis (PsA). It does, however, support the established concept that PsA occurs within the psoriasis spectrum and that the transition from psoriasis to PsA remains incompletely predictable. A systematic review and meta-analysis of 18 studies evaluated incident PsA among patients with psoriasis exposed to biologic DMARDs, conventional synthetic DMARDs, phototherapy, topical therapy, or no therapy; the primary analysis found no significant difference in PsA risk between biologic and non-biologic treatment, although the abstract does not provide the pooled estimate or complete subgroup results [113]A1a. Accordingly, biologic treatment should not currently be regarded as proven primary prevention of PsA [113]A1a.
Etiology and disease heterogeneity
The available evidence is consistent with PsA being a heterogeneous immune-mediated inflammatory disease involving musculoskeletal, cutaneous, and comorbidity domains, but the supplied studies do not establish a single initiating antigen, gene, or environmental trigger [118]B2b[527]. Phenotypic diversity is also reflected in spondylarthritis research that separately identified axial, peripheral, and psoriatic subtypes, although its small cross-sectional sample cannot define PsA epidemiology or causation [530]C. A retrospective study of HLA-B51-positive patients assessed classification across Behçet disease, axial or peripheral spondyloarthritis, and PsA, indicating that HLA-B51 may occur across overlapping inflammatory phenotypes; the study design does not establish HLA-B*51 as a PsA susceptibility allele [404]B3b.
Clinical expression is influenced by more than synovitis. In a tertiary-center cohort of 228 PsA patients without fibromyalgia, central sensitization was investigated as a contributor to persistent pain and therapeutic refractoriness; because the study was cross-sectional, it cannot determine whether central sensitization is a cause or consequence of PsA [533]. Similarly, residual disease may persist despite attainment of treatment targets, and a systematic review/meta-analysis found that residual disease in inflammatory arthritis can include ongoing joint findings, fatigue, and other patient-reported symptoms; these findings describe disease burden rather than etiologic risk [527]. Anxiety studies in inflammatory rheumatic diseases included PsA among 807 consecutive outpatients and examined sociodemographic, clinical, pain, fatigue, stress, and coping correlates, but their cross-sectional design does not establish anxiety as a cause of PsA [538].
Comorbidity-associated risk context
Psoriasis and PsA should be considered in a systemic cardiometabolic context. In the PSOCADIA cross-sectional study, 1,010 adults with psoriasis were compared with 1,010 age- and sex-matched controls without inflammatory skin disease, with assessment of cardiac structure, function, and cardiometabolic risk factors; the study addresses cardiovascular phenotype in psoriasis rather than PsA onset [528]. A nationwide Polish claims analysis compared comorbidities at diagnosis in incident RA and PsA identified during 2019–2021, using a 10-year lookback period; it supports substantial comorbidity assessment at diagnosis but administrative proxy definitions and observational design limit causal inference [532]. Psoriasis has also been associated with osteoporosis risk, and a retrospective study of 639 psoriasis patients developed a prediction model using DXA-defined osteoporosis, with a diagnostic threshold of T-score ≤−2.5; this is a psoriasis complication-risk model, not a validated PsA susceptibility model [531]. A US NHANES analysis of adults aged 20–59 years evaluated psoriasis and overactive bladder using survey cycles from 2005–2006 and 2009–2014; the cross-sectional design and psoriasis-focused population do not establish overactive bladder as a PsA risk factor [537].
Infection and treatment-related modifiers
Infection risk is relevant to the management of PsA but should not be confused with disease etiology. A systematic literature review of IL-23 inhibitors—guselkumab, risankizumab, and tildrakizumab—in psoriasis or PsA examined new tuberculosis (TB) infection and latent TB reactivation, with particular attention to high-prevalence Asia-Pacific settings; the evidence concerns treatment-associated infection surveillance rather than risk of developing PsA [112]B2a. A real-world cohort of 292 patients with immune-mediated inflammatory diseases, including PsA, treated with upadacitinib, baricitinib, or tofacitinib assessed herpes zoster incidence and associated factors; this similarly informs safety risk during JAK-inhibitor exposure, not PsA causation [534]. Randomized-trial evidence evaluating JAK inhibitors and other advanced therapies across immune-mediated diseases examined comparative and absolute cancer risk, prompted by malignancy concerns with tofacitinib in RA; these findings are treatment-safety evidence and cannot be used to infer that JAK inhibition causes or prevents PsA [525]. Five-year open-label extension data for deucravacitinib in plaque psoriasis and up to seven-year real-world data for secukinumab in psoriasis provide long-term therapy safety/effectiveness information, but neither study establishes a baseline PsA risk factor [526][117]B3b.
Other contextual evidence
A retrospective French MS-registry analysis addressed autoimmune comorbidities and cladribine use in multiple sclerosis, not PsA epidemiology or etiology [529]C. A global electronic-record cohort reported lower anterior uveitis risk with JAK inhibitors than anti-TNF therapy in autoimmune diseases, including PsA, but this concerns treatment outcomes rather than susceptibility to PsA [535]. A study of fibrinogen-to-platelet and other hematologic inflammatory indices included 24 patients with psoriatic spondylarthritis within a 64-patient spondylarthritis sample; its small cross-sectional design cannot define causal risk factors [530]C. Collectively, the evidence supports a multifactorial, immune-mediated, clinically heterogeneous disorder arising in a psoriasis-associated systemic inflammatory context, while leaving individual prediction of PsA onset unresolved [113]A1a[118]B2b[404]B3b.
| Domain | Current evidence | Interpretation |
|---|---|---|
| Psoriasis-to-PsA transition | 18-study systematic review/meta-analysis [113]A1a | Biologic therapy was not significantly different from non-biologic therapy for incident PsA in the primary analysis; prevention remains uncertain [113]A1a |
| Phenotype and genetics | Axial/peripheral/psoriatic phenotypes and HLA-B*51-positive cohorts [404]B3b[530]C | Supports heterogeneity; does not prove a specific genetic cause [404]B3b[530]C |
| Comorbidity context | Cardiovascular, osteoporosis, anxiety, bladder, and claims-based comorbidity studies [528][531][532][537][538] | Important clinical risk context, but generally cross-sectional or administrative and non-causal [528][531][532][537][538] |
| Treatment safety | IL-23 inhibitors, JAK inhibitors, deucravacitinib, and secukinumab studies [112]B2a[117]B3b[525][526][534] | Informs infection, malignancy, and long-term safety monitoring; does not define PsA etiology [112]B2a[117]B3b[525][526][534] |
Clinical Presentation
- ▸**≤4 active joints** defines oligoarticular disease and **>4 active joints** defines polyarticular disease in the FOREMOST early-PsA framework [539].
- ▸Axial PsA may occur in isolation or with oligoarticular or polyarticular peripheral disease [544].
- ▸Clinical assessment should include synovitis, enthesitis, dactylitis, axial symptoms, skin and nail disease, and relevant systemic comorbidities [162,171,541,544].
- ▸Normal or discordant CRP and ESR results do not exclude clinically important PsA activity [549].
- ▸In patients with psoriasis, early recognition of PsA is important because delayed diagnosis is associated with worse outcomes [148,170].
Psoriatic arthritis (PsA) is a heterogeneous inflammatory musculoskeletal disease associated with cutaneous psoriasis and a range of peripheral and axial manifestations. Clinical expression may include peripheral arthritis, enthesitis, dactylitis, axial inflammation, and involvement of the hip, knee, sacroiliac joints, spine, and heel entheses. Whole-body MRI studies demonstrate that inflammatory lesions may occur across clinically disparate peripheral and axial sites, supporting assessment beyond the joints that are symptomatic at presentation [162]C4.
Peripheral arthritis
Peripheral arthritis can be classified by the number of active joints. In the FOREMOST early-PsA cohort, oligoarticular disease was defined as ≤4 active joints, whereas polyarticular disease was defined as >4 active joints; active joints included swollen and/or tender joints [539]. The study enrolled patients with >1 to ≤4 swollen and >1 to ≤4 tender joints, although this entry definition was not confirmed by imaging [539]. Progression from oligoarticular to polyarticular disease is therefore a clinically relevant presentation and early-course phenotype, particularly during the first year after symptom onset [539].
The clinical pattern may be isolated axial disease, axial disease with oligoarticular involvement, or axial disease with polyarticular involvement. In a multicentre cohort of 621 patients, these phenotypes accounted for 28.2%, 40.6%, and 31.2% of patients, respectively [544]. This distribution illustrates that axial symptoms should not be regarded as mutually exclusive with peripheral arthritis [544].
Enthesitis and dactylitis
Enthesitis and dactylitis are recognized peripheral manifestations within the PsA spectrum and should be assessed in addition to synovitis [171]B2a. Heel entheses are among the sites specifically evaluated by whole-body MRI, together with peripheral joints and other entheses [162]C4. Their presence can contribute substantially to disease burden even when the number of clinically swollen joints is limited [171]B2a.
Axial disease
Axial PsA may involve the spine and sacroiliac joints and can coexist with peripheral arthritis [162]C4[544]. A systematic review and meta-analysis directly compared axial PsA with axial spondyloarthritis across disease activity, spinal function, inflammatory markers, and HLA-B27 positivity, indicating that these domains are important when characterizing axial presentations and distinguishing related phenotypes [541]. Because axial PsA may present as isolated axial disease or alongside oligoarticular or polyarticular involvement, clinical assessment should document both axial symptoms and the complete peripheral examination [541][544].
Skin and nail disease
PsA occurs in the context of psoriasis, but the cutaneous and musculoskeletal components may not be proportionate. Psoriasis is particularly frequent in the isolated-axial phenotype in the multicentre axial-PsA cohort [544]. PsA may also develop in people with new-onset psoriasis or in individuals with subclinical disease, making joint screening relevant even when musculoskeletal symptoms are limited [148]B2b. In people with psoriasis, PsA affects up to 22% according to a systematic review of prognostic prediction models [170]B2a. Delayed recognition is clinically important because it is associated with worse outcomes, whereas early intervention improves prognosis [148]B2b.
Disease activity, flares, and imaging-clinical discordance
Symptoms and examination findings may fluctuate over time, including patient-perceived flares. The PsA FLARE Questionnaire was evaluated alongside PsAID-12, clinical musculoskeletal and cutaneous examination, routine laboratory tests, and a global flare question, reflecting the multidimensional nature of flare assessment [336]C4. Disease activity may also be incompletely captured by routine examination: the MOSAIC study used whole-body MRI to quantify inflammation in peripheral joints, entheses, spine, sacroiliac joints, hips, knees, and heel entheses [162]C4.
Inflammatory markers can be discordant. A real-world study of CRP and ESR across rheumatic diseases specifically characterized concordant and discordant patterns and combined inflammatory phenotypes, supporting interpretation of normal or discrepant results in the context of the clinical examination rather than as standalone evidence for or against active PsA [549].
Associated systemic manifestations and comorbidity
PsA is a systemic inflammatory disease with clinically relevant extra-articular associations. Inflammatory bowel disease, including Crohn disease and ulcerative colitis, has been evaluated in comparative cohort analyses involving psoriasis, PsA, and ankylosing spondylitis [547]. Cardiovascular risk is increased in PsA, and atherosclerotic plaques may occur across carotid, femoral, and aortic vascular territories; therefore, cardiovascular risk assessment should not be limited to a single vascular bed [444]C4.
Clinical heterogeneity and prognostic clues
The phenotype at presentation can influence subsequent disease course. In early limited-joint PsA, FOREMOST evaluated predictors of progression from oligoarticular to polyarticular disease and the effect of apremilast on this transition [539]. Real-world studies have also identified heterogeneous trajectories toward minimal disease activity, including super-responder, delayed-responder, fluctuating-responder, and non-responder patterns after initiation of advanced therapy [545]. Circulating immune-cell profiles and transcriptomic signatures are being studied in relation to clinical manifestations and treatment response, but these biomarkers remain investigational and should not replace clinical assessment [540][542].
In children and adolescents, psoriatic arthritis may be included among juvenile spondyloarthritis phenotypes, in which peripheral arthritis, enthesitis-related disease, and treatment response may differ from adult presentations [543]. Finally, rheumatoid arthritis-associated serological patterns are not exclusive to rheumatoid arthritis: autoantibodies targeting shared-epitope-containing peptides have been investigated in PsA, emphasizing that serology alone should not define the clinical diagnosis [548].
| Domain | Clinical expression or assessment focus |
|---|---|
| Peripheral arthritis | Active swollen and/or tender joints; oligoarticular ≤4 versus polyarticular >4 active joints [539] |
| Enthesitis and dactylitis | Peripheral manifestations requiring assessment in addition to synovitis; heel entheses are a recognized imaging site [162]C4[171]B2a |
| Axial disease | Spine and sacroiliac involvement; may be isolated or combined with oligoarticular or polyarticular disease [541][544] |
| Skin disease | Psoriasis may accompany or precede musculoskeletal disease; cutaneous severity may not parallel joint involvement [148]B2b[170]B2a[544] |
| Systemic domains | Flares, inflammatory-marker patterns, inflammatory bowel disease, and multisite atherosclerosis [336]C4[444]C4[547][549] |
Diagnosis & Workup: Serology, Imaging & Classification Criteria
- ▸No supplied 2026 reference validates a new stand-alone serologic test or replaces clinical PsA diagnosis and established classification frameworks. [263][404]
- ▸IgA anti-CD74, circulating immune-cell profiles, CALLY and related indices, and S1P/S1PR remain investigational or adjunctive biomarkers. [263][540][259][558]
- ▸Whole-body MRI can map peripheral, entheseal, spinal, and sacroiliac inflammation, but cited studies do not establish diagnostic imaging cut-offs. [162]
- ▸Early oligoarticular PsA was operationalized as ≤4 active joints, with progression to polyarticular disease defined as >4 active joints; these are phenotyping thresholds, not diagnostic criteria. [539]
- ▸Radiographic sacroiliitis progression occurred in 45% of evaluable patients over a median 6-year follow-up in a large prospective cohort. [551]
- ▸HLA-B*51 status may assist phenotype interpretation in overlapping inflammatory syndromes but is not presented as a PsA diagnostic test. [404]
Diagnostic approach
Psoriatic arthritis (PsA) remains a clinical diagnosis based on the integrated assessment of inflammatory musculoskeletal symptoms, objective synovitis or enthesitis, psoriasis or psoriatic stigmata, axial disease, dactylitis, nail involvement, family history, and exclusion of alternative diagnoses. The supplied 2026 evidence does not propose a replacement for established clinical classification systems or validate a new diagnostic threshold. In particular, the available studies evaluate disease activity, prognosis, treatment escalation, or imaging abnormalities rather than establishing a definitive diagnostic test. [292]A1a[263]B3b[404]B3b
Disease pattern should be documented explicitly. FOREMOST enrolled patients with early oligoarticular PsA defined by more than 1 and up to 4 swollen joints and more than 1 and up to 4 tender joints, although imaging confirmation was not required; progression was assessed from oligoarticular disease, defined as ≤4 active joints, to polyarticular disease with >4 active joints. These thresholds are useful for phenotyping and longitudinal assessment, but they are not presented as diagnostic criteria. [539]
Serology and blood-based biomarkers
Routine serology remains primarily exclusionary and phenotypic rather than confirmatory in the evidence supplied. No cited study establishes a disease-specific antibody equivalent to a diagnostic gold standard. IgA anti-CD74 autoantibodies were measured in serum from 171 patients with PsA, including 127 with peripheral PsA and 44 with axial PsA, alongside 43 non-rheumatic disease controls and 43 patients with rheumatoid arthritis. The study examined associations with treatment escalation in peripheral PsA; therefore, anti-CD74 should be regarded as an investigational prognostic or treatment-stratification biomarker, not a stand-alone diagnostic assay. [263]B3b
The TOFA-PREDICT study evaluated circulating immune-cell biomarkers in 80 patients receiving tofacitinib, methotrexate, or etanercept and examined associations with clinical manifestations and achievement of minimal disease activity at week 16. These findings support research into response prediction but do not establish a diagnostic blood panel. [540] Similarly, lower CRP-albumin-lymphocyte (CALLY) index values were associated with higher disease activity in a retrospective cohort of 150 patients with PsA and 50 matched healthy controls; CALLY, neutrophil-to-lymphocyte ratio, monocyte-to-lymphocyte ratio, platelet-to-lymphocyte ratio, systemic immune-inflammation index, and pan-immune inflammation value are adjunctive activity measures rather than classification tests. [259]B3b
Inflammatory markers may be influenced by comorbidity. In a longitudinal electronic-health-record study spanning psoriasis, PsA, Crohn disease, and ulcerative colitis, inflammatory marker profiles varied according to body-mass-index category, emphasizing that biomarker interpretation should account for obesity and systemic inflammatory burden. [555] Serum S1P and S1PR levels were investigated in 43 patients with PsA—16 with recent-onset and 27 with established disease—against 21 healthy controls, with clinical, Doppler-ultrasound, MRI, bone-density, and structural assessments; these molecules remain research biomarkers rather than validated diagnostic tests. [558]
Imaging workup
Imaging should be directed by the suspected domain and the clinical question. MRI can detect inflammatory and structural abnormalities in peripheral joints, entheses, spine, and sacroiliac joints. In MOSAIC, whole-body MRI evaluated peripheral joints and entheses, spine, sacroiliac joints, hips, knees, and heel entheses at baseline, week 24, and week 48 in patients with PsA treated with apremilast, with or without stable methotrexate. This supports whole-body MRI as a research-sensitive method for mapping disease burden, but the study does not define diagnostic cut-offs. [162]C4
Subclinical entheseal disease may occur in people with psoriasis who have arthralgia but no established PsA. EPOS enrolled psoriasis patients with moderate-to-severe disease, arthralgia, and subclinical inflammatory or structural bone changes identified by hand MRI and/or high-resolution peripheral quantitative CT; patients with current or past PsA were excluded. Such abnormalities may identify risk or preclinical disease, but they should not be equated automatically with clinically established PsA. [552]
For axial symptoms, pelvic radiographs remain relevant for documenting sacroiliitis and structural progression. In a prospective cohort of 1,554 patients followed for a median of 6 years, 475 of 1,056 evaluable patients (45%) progressed by at least one sacroiliitis grade; progression was assessed with a sacroiliitis sum score from 0–8 based on modified New York grades. MRI remains important when inflammatory axial disease is suspected despite normal or equivocal radiographs, although the cited radiographic study itself did not establish MRI diagnostic thresholds. [551]
Plain radiographs of hands and feet are useful for baseline structural assessment and longitudinal damage scoring. A cohort of 674 patients used biennial radiographs and the modified Steinbrocker score to study damage repair, illustrating the value of standardized serial imaging; repair or score change should not be interpreted as evidence that the original diagnosis was incorrect. [253]B2b
Classification and differential diagnosis
The CASPAR framework remains a classification tool rather than a substitute for clinical diagnosis; however, the supplied references do not reproduce or update its point thresholds. HLA-B*51-positive patients were evaluated retrospectively for fulfillment of criteria for Behçet disease, axial or peripheral spondyloarthritis, and PsA, highlighting overlap among inflammatory arthritis phenotypes and the need to assess mucocutaneous, axial, peripheral, and extra-articular manifestations rather than relying on a single HLA result. [404]B3b
Classification should also account for phenotype overlap and treatment context. Obesity was associated with achievement of minimal disease activity across advanced-therapy classes in a longitudinal PsA cohort, while studies of biologic class and treatment line examined incident PsA risk among patients with psoriasis; neither study validates a diagnostic biomarker. [557][254]B2b Evidence comparing cycling versus mechanism-swapping after TNF-inhibitor failure addresses treatment strategy, not diagnosis. [242]A1a Composite measures such as ACR response, CPDAI, and other GRAPPA-OMERACT outcomes are designed to discriminate active treatment from placebo in trials and should not be used as diagnostic classification criteria. [292]A1a
Practical interpretation
A robust workup combines history, examination, domain-based joint and entheseal assessment, targeted radiography or MRI, and laboratory testing to support inflammation and exclude mimics. Novel immune-cell, antibody, lipid, nutritional-inflammatory, and imaging biomarkers should currently be documented as investigational and interpreted alongside—not instead of—clinical findings. Before immunosuppressive treatment, infection-risk assessment is clinically important; the cited guselkumab analysis specifically examined patients with latent tuberculosis infection, while noting updated consensus that routine latent-TB testing is not required before IL-17 or IL-23 inhibitors, unlike the longstanding practice associated with TNF inhibitors. [553] Cardiovascular, thromboembolic, and malignancy risk considerations are particularly relevant when JAK inhibitors such as upadacitinib are being considered, but these are treatment-safety issues rather than diagnostic criteria. [550]C
| Investigation | Evidence-supported role | Limitation |
|---|---|---|
| IgA anti-CD74 | Associated with treatment escalation in peripheral PsA | Not validated as a stand-alone diagnostic assay [263]B3b |
| Immune-cell biomarkers | Explored for manifestations and response to tofacitinib, methotrexate, or etanercept | Development-cohort evidence; not a diagnostic panel [540] |
| CALLY and blood-cell indices | Associated with disease activity | Adjunctive activity markers; affected by systemic and nutritional factors [259]B3b[555] |
| MRI/WB-MRI | Detects or maps peripheral, entheseal, axial, and sacroiliac abnormalities | No diagnostic cut-offs established in cited studies [162]C4[552] |
| Pelvic radiography | Documents structural sacroiliitis and progression | May miss active inflammation without structural change [551] |
| Hand/foot radiography | Baseline and serial structural damage assessment | Structural scoring is not itself diagnostic [253]B2b |
| HLA-B*51 | Helps assess overlap with Behçet disease and other spondyloarthritis phenotypes | Not a PsA-specific diagnostic marker [404]B3b |
Severity, Disease Activity & Risk Stratification
- ▸Use multidomain composite assessment because PsA activity may involve peripheral joints, axial sites, entheses, skin, nails, function, pain, fatigue, and structural damage. [292][560][291]
- ▸Residual disease can persist despite remission or low disease activity; reassess swollen joints, fatigue, pain, function, enthesitis, axial symptoms, and other domains not captured by the chosen target. [527]
- ▸Monitor early oligoarticular PsA closely: progression was modelled from **≤4 active joints** to **>4 active joints** at **week 16** in FOREMOST. [539]
- ▸Consider axial and whole-body imaging burden separately from peripheral joint counts, particularly when symptoms or objective findings are discordant. [541][162]
- ▸BMI, central sensitization, psychosocial factors, and comorbidities can influence apparent severity, treatment response, quality of life, and persistence. [557][533][559][562]
- ▸CALLY, immune-cell, S1P/S1PR, and nailfold microvascular measures are exploratory adjuncts and are not validated stand-alone PsA severity classifications. [259][540][558][556]
Multidomain assessment of disease activity
Psoriatic arthritis (PsA) severity cannot be inferred reliably from joint counts alone because peripheral arthritis, axial disease, enthesitis, dactylitis, skin and nail psoriasis, structural damage, pain, fatigue, function, and comorbidity may contribute independently to overall disease burden. Composite instruments are therefore central to treatment evaluation and clinical risk stratification. A GRAPPA–OMERACT systematic review and network meta-analysis evaluated seven shortlisted composite outcomes, including ACR response criteria and the Composite Psoriatic Disease Activity Index (CPDAI), to determine which measures best distinguish biologic or targeted synthetic DMARDs from placebo in randomised trials. [292]A1a The study addresses trial discrimination rather than establishing that one instrument should replace all others in routine practice. [292]A1a
For peripheral arthritis, an ASAS project used the OMERACT framework to identify the most appropriate disease-activity instrument for axial and peripheral spondyloarthritis, assessing domain match, feasibility, construct validity, test–retest reliability, responsiveness, clinical-trial discrimination, and thresholds of meaning. [560] A companion systematic review compared the measurement properties of instruments used to assess peripheral arthritis activity in patients with axial or peripheral spondyloarthritis. [291]B2a These findings support selecting instruments that specifically capture peripheral synovitis while interpreting them alongside patient-reported outcomes and extra-articular domains. [560][291]B2a
Remission, residual disease, and treatment targets
Achievement of a treatment target does not necessarily mean that all clinically important disease has resolved. A systematic review and meta-analysis defined residual disease as clinically relevant signs or symptoms persisting despite a low-activity or remission state, with extracted indicators including swollen joints and fatigue. [527] In practice, residual synovitis, pain, fatigue, functional limitation, skin disease, enthesitis, or axial symptoms should prompt reassessment of the disease domains not represented adequately by the selected target measure. [527]
Minimal disease activity (MDA) remains a clinically meaningful multidomain state because it incorporates several core PsA manifestations rather than a single laboratory or joint measure. [540][557] In a prospective biomarker study, MDA achievement was assessed at week 16 among DMARD-naive patients randomised to tofacitinib or methotrexate and among conventional-DMARD inadequate responders randomised to tofacitinib or etanercept; the study examined whether circulating immune-cell biomarkers improved individual response prediction. [540] These biomarkers should be regarded as investigational predictors rather than validated replacements for clinical assessment. [540]
Early disease and progression risk
Limited joint involvement does not guarantee a benign course. FOREMOST enrolled patients with early PsA of approximately 10 months’ mean duration and >1 to ≤4 swollen and tender joints, then modelled progression from oligoarticular disease (defined as ≤4 active joints) to polyarticular disease (>4 active joints). [539] The study evaluated predictors of progression at week 16 and the effect of apremilast, with open-label apremilast continuing through week 48. [539] These data reinforce the importance of monitoring early oligoarticular PsA for expansion of joint involvement rather than relying only on the initial joint count. [539]
Risk stratification also begins before clinical PsA is apparent. A psoriasis inception-cohort study developed and internally validated multivariable models to identify people with new-onset psoriasis who merit rheumatology referral and those with subclinical PsA at high risk of developing clinical disease. [148]B2b In psoriasis patients with arthralgia and subclinical inflammatory or structural entheseal abnormalities on MRI or high-resolution peripheral quantitative CT, a 24-week single-arm apremilast study evaluated changes in entheseal bone damage. [552] These approaches remain risk-assessment or exploratory intervention strategies and should not be interpreted as establishing routine preventive DMARD treatment for psoriasis without clinical PsA. [148]B2b[552]
Axial, entheseal, and imaging burden
Axial PsA should be assessed separately from peripheral arthritis because axial symptoms, spinal function, imaging inflammation, and inflammatory markers may not track with peripheral joint counts. A systematic review and meta-analysis compared clinical features, disease activity, spinal function, inflammatory markers, and HLA-B27 positivity between axial PsA and axial spondyloarthritis. [541] Whole-body MRI in the MOSAIC phase 4 study assessed inflammation in peripheral joints and entheses, the spine and sacroiliac joints, hips, knees, and heels at baseline, week 24, and week 48 during apremilast treatment with or without stable methotrexate. [162]C4 MRI can therefore identify inflammatory burden in clinically silent or difficult-to-examine sites, but imaging findings should be integrated with symptoms and examination. [162]C4
Prognostic modifiers and discordant symptoms
Obesity is a relevant treatment and outcome modifier. A longitudinal cohort study evaluated BMI in relation to MDA and its individual components over time, adjusting for demographic, psychological, smoking, treatment, and radiographic factors and examining multiple advanced-therapy classes. [557] Persistent pain may also reflect mechanisms beyond inflammation: in a cohort excluding fibromyalgia, central sensitization was assessed in 228 consecutive PsA patients and examined in relation to clinical phenotype and therapeutic refractoriness. [533] Thus, high patient-reported pain with limited objective inflammation should trigger assessment for central sensitization and other comorbid contributors rather than automatic escalation of immunosuppression. [533]
Potential adjunctive markers include the CALLY index, which combines CRP, albumin, and lymphocyte information; a retrospective longitudinal study of 150 PsA patients and 50 matched controls examined its association with disease activity. [259]B3b Other exploratory studies assessed circulating immune-cell profiles, serum S1P/S1PR in relation to DAPSA, bone health, Doppler ultrasound, and MRI, and nailfold microvascular abnormalities in women with distal interphalangeal arthritis receiving TNF inhibitors. [540][558][556] These biomarkers are not established stand-alone severity classifications. [259]B3b[540][558][556]
Patient-reported burden and outcomes
Disease activity assessment should include function, quality of life, fatigue, pain, sleep, and psychosocial context. EQ-5D-3L and EQ-VAS demonstrated evaluated construct validity and responsiveness across groups with differing function or disease activity in a Swedish registry study. [561] A digital-health segmentation study used patient global disease activity, pain, sleep, and psychosocial variables to identify clinical-psychosocial archetypes and relate them to 12-week outcomes. [559] Sexual quality of life was followed prospectively for 5 years in an outpatient cohort, illustrating that long-term disease burden extends beyond standard inflammatory measures. [564]C
Real-world treatment persistence, including comparative evaluation of upadacitinib and tofacitinib with DAPSA data, may provide a pragmatic indicator of durability, tolerability, and perceived benefit, but it is observational and should not be equated with comparative efficacy. [562] Perioperative risk assessment should likewise incorporate disease activity, patient-reported outcomes, comorbidity, BMI, and operative context; a prospective arthroplasty study evaluated whether PsA-specific activity and synovial inflammation were associated with postoperative adverse events. [563]C
Practical risk-stratification framework
Classify patients by objective inflammatory burden, number and distribution of active joints, axial or entheseal involvement, structural damage, skin and nail severity, functional and patient-reported burden, comorbidity, and trajectory over time. [291]B2a[527][541][557] Escalated surveillance is particularly appropriate for early oligoarticular disease, rapidly increasing joint counts, persistent objective inflammation despite a target state, axial or imaging inflammation, substantial obesity or comorbidity, and pain–inflammation discordance. [539][527][162]C4[557][533]
| Domain | Assessment focus | Evidence |
|---|---|---|
| Peripheral arthritis | Active joint burden and validated disease-activity instruments | [560][291]B2a |
| Composite target state | Multidomain response and treatment-target assessment | [292]A1a[527] |
| Early progression | Oligoarticular-to-polyarticular transition; ≤4 vs >4 active joints | [539] |
| Axial/entheseal disease | Spine, sacroiliac joints, entheses, function, MRI inflammation | [541][162]C4 |
| Patient burden | Pain, fatigue, function, HRQoL, sleep, sexual quality of life | [527][561][559][564]C |
| Modifiers and adjuncts | BMI, central sensitization, biomarkers, persistence, perioperative risk | [557][533][259]B3b[540][562][563]C |
Acute Management: Flares & Organ-Threatening Disease
- ▸PsA flare definitions are heterogeneous; reported incidence was 10%–27% over 6 months and 22%–23% over 12 months. [88]
- ▸Use multidomain clinical assessment and patient-reported flare tools; the FLARE questionnaire is an adjunct, not a replacement for examination. [88,571]
- ▸After tapering or withdrawal, reassess promptly and consider reinstating effective therapy; evidence supports retreatment studies but does not establish one universal tapering or recapture protocol. [565,568]
- ▸ICI initiation in patients with preexisting PsA requires coordinated oncology–rheumatology risk–benefit assessment of baseline immunosuppression. [317,566,327]
- ▸Severe ocular, bowel, infectious, neurologic, articular, or cutaneous presentations require urgent specialty evaluation; the supplied evidence does not define a PsA-specific organ-threatening rescue algorithm. [88,151,573]
Scope and immediate assessment
A PsA flare should be assessed as a multidomain escalation rather than by joint count alone, including peripheral synovitis, enthesitis, dactylitis, axial symptoms, skin and nail disease, function, pain, fatigue, and patient-perceived disease activity. The evidence base does not provide a universally accepted flare definition: a systematic review identified 54 studies, with definitions varying substantially across cohorts and trials. Reported current-flare prevalence ranged from 7% to 50%, incidence from 10% to 27% over 6 months, and from 22% to 23% over 12 months. [88]A1a The FLARE questionnaire is a multidimensional patient-reported instrument; subsequent validation work used a patient anchor question and receiver-operating-characteristic analysis to determine a cutoff and assess longitudinal change, supporting its use as an adjunct to clinical assessment rather than as a substitute for examination. [571]
Urgent evaluation is warranted when there is rapidly progressive polyarthritis, severe functional loss, a hot swollen joint requiring exclusion of infection or crystal arthritis, suspected axial neurologic compromise, severe dactylitis or enthesitis, or extra-articular disease involving the eye, bowel, or other organs. The supplied references do not establish a PsA-specific emergency drug algorithm or define organ-threatening PsA treatment thresholds; management should therefore be individualized with rheumatology and the relevant specialty, while infection, malignancy, medication toxicity, and alternative inflammatory or infectious diagnoses are actively considered. [88]A1a[151]B2b
Flare after DMARD tapering or withdrawal
Withdrawal or dose-spacing of biologic or targeted synthetic DMARD therapy should generally be considered only after sustained, clinically meaningful control and shared decision-making. The 2025 systematic review identified 11 observational studies and 4 randomized controlled trials of biologic DMARD tapering or withdrawal in PsA; most evidence was observational, and the review specifically evaluated remission criteria, relapse definitions, retreatment outcomes, safety, quality of life, costs, and predictors of successful tapering. [568] The review of adalimumab and other TNF-inhibitor discontinuation likewise included 49 studies across inflammatory arthritides, including PsA, and examined successful discontinuation, tapering approaches, flare, and recapture after restarting treatment. [565]
If a flare follows tapering, promptly reassess disease domains and reinstate the previously effective regimen when appropriate; the available reviews indicate that retreatment and recapture were specifically studied, but the supplied abstracts do not provide a single reliable PsA-wide recapture percentage or preferred tapering schedule. [565][568] Patient perception is clinically important: among participants meeting minimal disease activity, 88.4% reported good disease status, although the relationship varied according to which individual MDA components were unmet. [574]
Selecting treatment for active or refractory disease
For active PsA requiring escalation, treatment should be directed at the dominant and prognostically important domains, with attention to comorbid psoriasis, inflammatory bowel disease, uveitis, and axial disease. In pooled phase 3 KEEPsAKE analyses, risankizumab demonstrated efficacy across GRAPPA domains—including peripheral arthritis, enthesitis, dactylitis, skin and nail psoriasis, and axial disease—and related conditions including inflammatory bowel disease and uveitis through approximately 100 weeks of treatment. These data support sustained domain-based therapy, but they do not establish risankizumab as a universal rescue treatment for an acute flare. [151]B2b
Deucravacitinib was evaluated in a 16-week, phase 2 randomized trial of 203 adults with active PsA, including patients with prior NSAID, glucocorticoid, conventional synthetic DMARD, and/or TNF-inhibitor failure or intolerance. One background conventional synthetic DMARD was permitted if stable. A post hoc analysis examined efficacy and safety according to background DMARD use; these data may inform escalation choices but do not define acute organ-threatening management. [569]
In children with juvenile PsA or enthesitis-related arthritis, disease activity should be measured with validated pediatric tools where possible. In the JUNIPERA phase 3 withdrawal study, the Juvenile Spondyloarthritis Disease Activity Index was assessed after 12 weeks of open-label secukinumab and during randomized continuation or placebo withdrawal through week 52; validation was examined against JADAS10, clinical JADAS10, and physician global assessment. [323]A1b A separate phase 3 withdrawal analysis found that children with polyarticular-course JIA, PsA, or enthesitis-related arthritis receiving tofacitinib were assessed using JADAS thresholds and ACR response criteria; responders were randomized at week 18 and followed to week 44 or flare. [324]A1b
Immune-checkpoint-inhibitor-associated disease
When PsA predates immune checkpoint inhibitor (ICI) therapy, baseline immunosuppression requires a cancer-specific risk–benefit discussion because treatment may reduce flare risk but could potentially affect cancer outcomes. The 2025 Canadian living guideline was developed by rheumatologists, oncologists, researchers, and a patient representative specifically to guide baseline immunosuppression for preexisting inflammatory arthritides at ICI initiation. [317]A1c Observational evidence remains important because patients with autoimmune disease were excluded from randomized ICI trials; a systematic review and meta-analysis included 95 studies and 23,897 patients with cancer and preexisting autoimmune disease, evaluating de novo immune-related adverse events, autoimmune flares, hospitalizations, and deaths. [566] A separate meta-analysis included 31 studies and more than 700 patients with preexisting rheumatologic disease receiving ICIs and quantified grade 1–5 and grade 3–5 flares, although the supplied abstract does not provide PsA-specific pooled estimates. [327]A1a
For ICI-associated psoriasis or PsA, apremilast has limited supportive evidence: a multicenter cohort included 21 patients treated for ICI-associated psoriasis and/or PsA, but only five had ICI-PsA alone, making conclusions about efficacy and cancer safety uncertain. [232]C4 ICI therapy should not be interrupted or immunosuppression intensified without coordination between oncology and rheumatology unless clinically necessary for severe or organ-threatening toxicity. [317]A1c[566]
Safety and follow-up
Vaccination is not established as a common trigger for inflammatory-arthritis flares: a systematic review and meta-analysis evaluated flare risk and adverse events after COVID-19 vaccination in inflammatory arthritis, but the supplied abstract does not provide PsA-specific effect estimates. [567] Patients presenting to emergency care may have potentially avoidable lower-acuity utilization; in a population-based Alberta cohort, 47.6% of people with PsA accessed the emergency department annually, and the study specifically examined triage acuity, diagnoses, disposition, and access to ambulatory care. [575] Rapid specialist access and structured follow-up are therefore important after an acute presentation. [575]
Psoriasis and PsA may complicate surgical recovery: a national database study of total hip arthroplasty evaluated superficial and deep surgical-site infection, 90-day sepsis, and 2-year revision outcomes in patients with cutaneous psoriasis or PsA. [546]C Hospital-based psoriasis data also included erythrodermic and generalized pustular psoriasis, conditions requiring urgent dermatologic assessment; among 2,223 hospitalized patients, 4.8% had erythrodermic psoriasis and 2.0% generalized pustular psoriasis. [573] These severe cutaneous presentations should be managed as medical emergencies in parallel with assessment of joint disease. [573]
| Presentation | Immediate priorities | Evidence boundary |
|---|---|---|
| Suspected PsA flare | Define affected domains, quantify patient-perceived flare, assess function and inflammatory burden, and exclude infection or crystal disease when clinically indicated. [88]A1a[571] | No single validated universal flare definition or acute rescue regimen is established in the supplied references. [88]A1a |
| Flare after DMARD tapering | Review timing and adherence, reassess all PsA domains, and consider returning to the last effective regimen. [565][568] | Optimal tapering schedule and PsA-wide recapture rate are not provided. [565][568] |
| ICI-associated PsA or psoriasis | Coordinate urgently with oncology; balance arthritis control, immune-related toxicity, and cancer outcomes. [317]A1c[566][327]A1a | Apremilast evidence is limited to a small cohort, with only five patients having ICI-PsA alone. [232]C4 |
| Severe skin disease | Treat erythrodermic or generalized pustular psoriasis as urgent systemic disease requiring specialist care. [573] | The supplied references do not specify a preferred acute psoriasis regimen. [573] |
Long-term Management: The DMARD Ladder & Treat-to-Target
- ▸Use a multidomain, treat-to-target review and track MDA longitudinally; real-world responses may be rapid, delayed, fluctuating, or absent. [545] [580]
- ▸Do not equate persistent pain with inflammatory activity without evaluating central sensitization and other pain mechanisms. [533]
- ▸A low joint count is not a reason for therapeutic inertia: FOREMOST studied progression from **1–4 active joints** to **more than 4 active joints**. [539]
- ▸Escalate or switch according to active domains, structural risk, comorbidity, safety, adherence, and patient preference rather than a rigid one-size-fits-all ladder. [551] [562]
- ▸Biologic therapy has not been established as prevention of incident PsA in patients with psoriasis. [113] [254]
- ▸Perioperative continuation or interruption of DMARDs is a separate individualized decision and should not be generalized to routine long-term discontinuation. [288] [577]
Management principle
Long-term PsA management should follow a domain-based, treat-to-target strategy: establish the patient’s dominant manifestations, select a DMARD capable of treating those domains, reassess systematically, and modify therapy when the target is not achieved. The need for structured assessment is emphasized by EXPLORE-PsA, which was developed to examine the inconsistent routine use of composite and domain-specific disease-activity measures across international practice settings. [580] Real-world trajectory data likewise show that patients beginning a biologic or targeted synthetic DMARD may follow super-responder, delayed-responder, fluctuating-responder, or non-responder courses over at least 24 months, supporting repeated assessment rather than assuming that an early partial response will be durable. [545]
Step 1: Confirm the treatment target and disease domains
At each review, assess peripheral arthritis, enthesitis, dactylitis, axial disease, skin and nail psoriasis, pain, physical function, and patient-reported impact. This multidomain approach is important because systemic inflammation and symptoms may diverge in spondyloarthritis, and hematologic inflammatory indices have not yet established a sufficiently validated role for routine phenotypic differentiation or prediction of patient-reported activity. [530]C Central sensitization can also contribute to persistent pain and therapeutic refractoriness even when fibromyalgia is excluded, so residual pain should not automatically be interpreted as uncontrolled synovitis or as evidence that every DMARD has failed. [533]
A practical target is sustained minimal disease activity (MDA), or the lowest achievable disease activity across all clinically important domains, while separately documenting remission or inactive disease when appropriate. MDA achievement should be recorded longitudinally: in a real-world cohort, patients were assessed at six-month intervals and differed substantially in the speed and durability of MDA attainment. [545] Biomarker-guided selection is not yet ready for routine use; a small TOFA-PREDICT development cohort evaluated circulating immune-cell biomarkers for prediction of response to tofacitinib, methotrexate, or etanercept, but this work was exploratory and does not establish a validated treatment-selection algorithm. [540]
Step 2: Start and optimize conventional therapy when appropriate
For predominantly peripheral, treatment-naive disease, a csDMARD—most commonly methotrexate in routine practice—may be used when clinically appropriate, particularly when peripheral joints and psoriasis require simultaneous attention. The available TOFA-PREDICT study specifically compared tofacitinib with methotrexate in DMARD-naive patients and compared tofacitinib with etanercept in csDMARD inadequate responders; its small development cohort should be interpreted as comparative-response research rather than a universal sequencing rule. [540]
Patients with limited oligoarticular disease still require close surveillance. FOREMOST enrolled people with early PsA and 1–4 swollen and 1–4 tender joints and evaluated progression to polyarticular disease, defined as more than 4 active joints, while studying apremilast versus placebo through week 24 and open-label apremilast through week 48. [539] Thus, a low joint count should not justify therapeutic inertia, especially when prognostic features or progression are present. Apremilast has also been evaluated with whole-body MRI over 48 weeks, including peripheral joints, entheses, spine, sacroiliac joints, hips, knees, and heels, with or without stable methotrexate; these imaging data support assessment beyond the clinically most obvious joint. [162]C4
Step 3: Escalate to biologic or targeted synthetic DMARD therapy
Escalate when disease remains active, progresses, or produces unacceptable burden despite an adequate csDMARD trial, or when the initial phenotype warrants advanced therapy. Choice should be driven by the dominant domain and comorbidities rather than by a rigid universal ladder. Longitudinal cohort evidence demonstrates clinically meaningful structural progression: 45% of 1,056 evaluable patients showed at least one-grade radiographic sacroiliitis progression during a median 6-year follow-up, with associations reported for factors including male sex, swollen-joint burden, PASI, and nail disease. [551] Separate radiographic work has examined whether joint damage can repair and identified predictors using biennial hand and foot assessments and multistate models, reinforcing the importance of preventing progression rather than treating symptoms alone. [253]B2b
For axial or sacroiliac involvement, objective imaging and longitudinal structural assessment are particularly relevant. Apremilast’s WB-MRI study specifically evaluated axial and peripheral inflammation, but its single-arm, open-label design limits comparative conclusions about axial DMARD selection. [162]C4 In patients with substantial skin or nail disease, coordinate rheumatology and dermatology goals; observational studies of psoriasis populations have not established that biologic therapy prevents incident PsA. [113]A1a A population-based cohort likewise evaluated TNF, IL-17, IL-23p19, and IL-12/23 inhibitors, including second-line biologic therapy, for incident PsA risk, but prevention of PsA should not currently be treated as an established indication for choosing a biologic. [254]B2b
Step 4: Switch, continue, or de-escalate deliberately
If the target is not reached, verify adherence, diagnosis, inflammatory activity, comorbid pain mechanisms, and domain coverage before switching. Real-world persistence data comparing upadacitinib and tofacitinib provide pragmatic information about durability and discontinuation, but their retrospective observational design means persistence should not be equated with comparative efficacy. [562] When changing to a JAK inhibitor, discuss individualized malignancy and cardiovascular or thrombotic risk according to current regulatory safety practice; the 2026 systematic review and Bayesian network meta-analysis was designed to compare cancer risk of JAK inhibitors with other advanced therapies across immune-mediated inflammatory diseases, including psoriasis and PsA, using randomized trials and long-term extensions. [525]
Treatment interruption should be minimized when it risks flare, but perioperative decisions require individualized planning. A 2026 Cochrane review assessed continuation versus interruption of csDMARDs, biologics, and targeted synthetic DMARDs around elective surgery because immunomodulation may affect infection risk while withdrawal may worsen inflammatory disease; the evidence addresses a specific perioperative question and should not be generalized to routine long-term discontinuation. [288]A1a Surgical-outcome research has also examined DMARD use and complications after total hip arthroplasty in inflammatory arthritis, including PsA, but retrospective claims data cannot define a universal perioperative regimen. [577]
Monitoring and implementation
Reassess at a predefined interval, document the same composite and domain-specific measures, and record skin, nail, imaging, function, pain phenotype, safety, and treatment persistence. Diagnostic delay and delayed initiation of a biologic or targeted synthetic DMARD have been studied in relation to adverse pain-related cognitive responses, supporting early recognition and timely escalation when active PsA is present. [579] Pediatric and young-adult PsA data from etanercept-treated juvenile idiopathic arthritis populations show that clinically inactive disease and sustained remission are achievable but not universal, supporting age-appropriate, prolonged follow-up rather than assuming cure after initial control. [241]B2b
Do not use unrelated molecular or genetic associations as treatment-selection evidence: the aspartame network-toxicology study addressed rheumatoid arthritis mechanisms, not PsA treatment, while the HLA study concerned generalized pustular psoriasis rather than PsA DMARD sequencing. [578] [576]C
| Clinical situation | Management approach | Evidence anchor |
|---|---|---|
| Newly diagnosed peripheral PsA | Consider a csDMARD when appropriate; define a measurable target and reassess systematically. | [540] [580] |
| Limited oligoarticular disease | Monitor closely for progression despite a low baseline joint count; apremilast was studied in early oligoarticular PsA. | [539] |
| Persistent active or structurally threatening disease | Escalate to a biologic or targeted synthetic DMARD selected for the dominant domain and comorbidities. | [545] [551] |
| Inadequate response or intolerance | Check adherence, inflammatory activity, pain mechanisms, and domain coverage; then optimize or switch therapy. | [533] [562] |
| Surgery planned | Individualize continuation or interruption using procedure, infection risk, drug, and flare risk. | [288]A1a [577] |
Multisystem & Extra-Articular Involvement (Organ-by-Organ Map)
- ▸ILD is an emerging PsA-associated pulmonary concern; available evidence includes meta-analyses and cohorts, but no universal screening threshold is established. [123][401][587][589]
- ▸A psoriasis cohort found ILD in **12/117 (10%)** patients overall and **6/65** patients with PsA. [589]
- ▸IL-17 inhibition may rarely be associated with paradoxical or new-onset SLE; new systemic or serological features warrant reassessment. [38]
- ▸Subclinical sensorineural hearing abnormalities were reported in a cross-sectional study of **53** patients with PsA. [586]
- ▸Cardiovascular risk, infection prevention, vaccination, work participation, and socioeconomic strain should be assessed as components of systemic PsA care. [399][581][582][583][590]
Scope and interpretation
Psoriatic arthritis (PsA) is a systemic inflammatory disease in which extra-articular findings may reflect psoriatic disease, comorbidity, treatment toxicity, or an alternative inflammatory diagnosis. [404]B3b Evidence in this update is heterogeneous, ranging from systematic reviews and meta-analyses to retrospective cohorts and small cross-sectional studies; therefore, reported associations should not automatically be interpreted as causal or as universal clinical manifestations of PsA. [123]A1a[401]A1a[586]
Skin, nails, and mucosa
Psoriasis remains the principal extra-articular disease domain associated with PsA, while the available references do not provide updated prevalence estimates for skin or nail findings. [401]A1a[587]C In patients with psoriatic disease, evaluation should distinguish disease manifestations from treatment-related events and from features suggesting another systemic inflammatory disorder. [38]B3a[404]B3b
Eye and neuro-ophthalmic system
Uveitis is clinically relevant in the differential diagnosis of PsA and other spondyloarthritis-spectrum diseases, but the supplied studies do not establish a new PsA-specific prevalence estimate. [258]B3b[404]B3b In a small serological study involving 9 patients with PsA, serum immunoreactivity to neurofilament-medium was assessed alongside Behçet disease, systemic lupus erythematosus, multiple sclerosis, non-Behçet uveitis, and healthy controls; this was an exploratory biomarker investigation and does not establish neuro-ophthalmic involvement in PsA. [258]B3b HLA-B*51-positive cohorts were evaluated across Behçet disease, axial and peripheral spondyloarthritis, and PsA phenotypes, with analysis of extra-articular manifestations, but the supplied abstract does not provide PsA-specific frequencies sufficient for routine risk prediction. [404]B3b
Pulmonary system
Interstitial lung disease (ILD) is an increasingly recognized but not classically established extra-articular manifestation of PsA. [123]A1a A 2026 systematic review and meta-analysis pooled ILD prevalence in PsA and evaluated associated risk factors and comparative risk, although the supplied abstract does not report the pooled numerical estimate. [123]A1a A nationwide TriNetX analysis covering 2014–2024 compared adults with PsA and psoriasis who were receiving systemic immunosuppressive therapy, excluding other autoimmune diseases; it specifically evaluated whether PsA carried greater ILD risk than psoriasis and adjusted comparisons by propensity-score methods. [587]C A separate retrospective psoriasis cohort identified ILD in 12/117 (10%) patients overall, including 6/65 patients with PsA; the cohort required pre-treatment chest imaging and excluded other recognized causes of ILD, limiting generalizability. [589]C A systematic review and meta-analysis of psoriatic disease likewise evaluated ILD prevalence overall and by disease subtype, sex, and smoking history, supporting pulmonary involvement as a potential complication across the psoriatic disease spectrum. [401]A1a These data support symptom review and targeted imaging or pulmonary assessment when dyspnea, cough, hypoxemia, crackles, abnormal pulmonary function, or other clinical concern is present, but they do not justify universal ILD screening based solely on a PsA diagnosis. [123]A1a[401]A1a[587]C[589]C
Cardiovascular and thrombotic system
PsA care should include assessment of cardiovascular risk because patients with inflammatory rheumatic diseases may experience major adverse cardiovascular events and thrombotic events during targeted therapy; however, the supplied hospital registry study combined rheumatoid arthritis, spondyloarthritis, and PsA and primarily assessed treatment safety rather than defining PsA-specific baseline cardiovascular burden. [582]C In that retrospective Spanish cohort, patients initiating targeted treatment between 2019 and late 2024 were evaluated for major adverse cardiovascular events, arterial and venous thrombosis, disease activity, traditional cardiovascular risk factors, comorbidity burden, and treatment exposure. [582]C The evidence therefore supports individualized cardiovascular-risk assessment and management, without allowing a PsA-specific event rate to be inferred from the abstract. [582]C
Infection, vaccination, and immune complications
In the SUCCEED prospective study, adults with immune-mediated inflammatory diseases who had received at least 3 COVID-19 vaccine doses were followed with monthly saliva PCR testing from September 2022 through August 2023 and with anti-spike, receptor-binding-domain, and nucleocapsid antibody measurements. [581] The supplied abstract does not provide a PsA-specific breakthrough-infection rate, so these results should be used as broader immune-mediated inflammatory disease evidence rather than as a PsA-specific estimate. [581] A separate observational study of fourth-dose SARS-CoV-2 vaccination included 218 patients with immune-mediated rheumatic diseases and 123 healthy controls, assessing neutralizing antibodies against Wuhan and Omicron variants over 1–20 weeks and examining immunosuppressive therapy and vaccine schedule effects. [583] These studies support vaccination planning and individualized review of immunomodulatory treatment, but do not establish a unique PsA vaccination response from the provided data. [581][583]
Autoimmunity and treatment-associated paradoxical disease
IL-17 inhibitors used in PsA—secukinumab, bimekizumab, brodalumab, and ixekizumab—were reviewed for both potential efficacy in systemic lupus erythematosus (SLE) and reports of new-onset or induced SLE. [38]B3a The systematic review searched literature through 30 June 2025 and identified the possibility of paradoxical lupus occurring during IL-17 inhibition, although the supplied abstract does not provide drug-specific incidence estimates. [38]B3a New lupus-like symptoms, serological abnormalities, or organ involvement during IL-17 inhibition should therefore prompt clinical reassessment rather than being assumed to represent PsA activity. [38]B3a
Hearing and otologic system
A retrospective cross-sectional study compared 53 patients with PsA, 53 with ankylosing spondylitis, and 53 age- and sex-matched healthy controls using pure-tone audiometry. [586] The study reported subclinical sensorineural hearing loss based on bone-conduction thresholds in PsA and investigated relationships with disease activity, inflammation, comorbidities, and clinical features. [586] Because the design was retrospective and cross-sectional, the finding supports awareness of possible auditory involvement but does not establish progression, causality, or a requirement for routine audiometric screening in all PsA patients. [586]
Function, work, and socioeconomic health
Extra-articular burden includes functional and societal consequences. [399]B2c The German National Database analyzed 16,421 patients younger than 65 years with inflammatory rheumatic diseases, including PsA, from 2010–2022, examining employment, absenteeism, disability pensions, and standardized employment ratios. [399]B2c A separate 2026 study compared socioeconomic status among 113 patients with PsA and other chronic inflammatory disease groups using validated financial-distress and socioeconomic-status instruments. [590] These studies support asking about work participation, financial strain, disability, and access to care as part of comprehensive PsA management, although the supplied abstracts do not provide PsA-specific effect estimates. [399]B2c[590]
Practical organ-by-organ assessment
At review, document skin and nail activity, ocular symptoms, respiratory symptoms and risk factors, cardiovascular and thrombotic risk, infection and vaccination status, new lupus-like features during IL-17 inhibition, hearing concerns, and work or socioeconomic impact. [38]B3a[123]A1a[399]B2c[401]A1a[581][582]C[583][586][587]C[589]C[590] Do not misclassify findings associated with Behçet disease, SLE, or other spondyloarthritis phenotypes as PsA without appropriate clinical correlation. [38]B3a[258]B3b[404]B3b
| Domain | Evidence update | Clinical implication |
|---|---|---|
| Pulmonary | ILD prevalence and comparative risk are under active investigation; PsA-specific pooled numerical prevalence was not provided in the supplied abstracts. [123]A1a[401]A1a[587]C | Investigate respiratory symptoms and use targeted pulmonary testing or imaging when clinically indicated. [123]A1a[401]A1a[587]C[589]C |
| Cardiovascular/thrombotic | Targeted-therapy registry data included PsA but combined several rheumatic diseases. [582]C | Assess traditional cardiovascular and thrombotic risk individually. [582]C |
| Eye/neuro-ophthalmic | PsA was included in exploratory biomarker and HLA-B*51 phenotype studies without actionable PsA-specific estimates. [258]B3b[404]B3b | Evaluate uveitis or Behçet-like features diagnostically rather than assuming PsA. [258]B3b[404]B3b |
| Hearing | Bone-conduction audiometry suggested subclinical sensorineural loss in PsA. [586] | Ask about hearing symptoms; routine screening remains unproven. [586] |
| Infection/vaccination | IMID cohorts were assessed after ≥3 vaccine doses and after a fourth dose. [581][583] | Maintain individualized vaccination and infection-risk planning. [581][583] |
| Function/society | Employment, absenteeism, disability, and socioeconomic status were evaluated in PsA-containing cohorts. [399]B2c[590] | Include work capacity and financial strain in disease assessment. [399]B2c[590] |
Complications: Disease-Driven & Treatment-Related
- ▸CV complications are a major disease-driven concern: 12.46% of a 10-year PsA cohort developed a CV event, at a rate of 1.33 per 100 patient-years. [593]
- ▸Assess traditional risk factors, disease activity, hyperuricaemia, arrhythmias and multiterritorial atherosclerosis; consensus guidance supports structured CV prevention and screening. [591][119][444]
- ▸JAK inhibitors require individualized assessment of malignancy, major adverse cardiovascular event and venous-thromboembolism risk. [525][550]
- ▸IL-23 inhibitor studies specifically address TB infection and LTBI reactivation, while guselkumab has been evaluated for up to 5 years in LTBI-positive patients. [112][553]
- ▸Preventive vaccination should include shingles, influenza, COVID-19 and pneumococcal vaccines; uptake remains inconsistent. [534][596]
- ▸Screen for osteoporosis when clinically indicated, including use of DXA; osteoporosis was defined as T-score ≤ −2.5 in a psoriasis cohort. [531]
- ▸Isoniazid prophylaxis can cause hepatotoxicity, particularly requiring care in patients with previous DMARD-related liver injury. [594]
Cardiovascular and vascular complications
Psoriatic arthritis (PsA) is associated with clinically important cardiovascular (CV) morbidity. In the 10-year CARMA prospective cohort, 85 of 682 patients (12.46%) without previous CV events developed a CV event during 6,397 patient-years of follow-up, corresponding to 1.33 events per 100 patient-years; older age, male sex, disease activity and hyperuricaemia were relevant predictors. [593] A 2026 Austrian rheumatology consensus therefore recommends structured CV-risk prevention, screening and management in PsA, alongside rheumatoid arthritis and spondyloarthritis. [591]
Subclinical and established vascular disease may be more extensive than conventional risk scores indicate. In a cross-sectional study of 250 patients with PsA, carotid, femoral and aortic territories were assessed for plaque, and multiterritorial atherosclerosis was evaluated for incremental value beyond SCORE2. [444]C4 Cardiac abnormalities have also been documented in psoriasis: the PSOCADIA study compared 1,010 adults with psoriasis with 1,010 matched controls using echocardiography and evaluated hypertrophy, valvular disease, systolic and diastolic dysfunction, and impaired global longitudinal strain. [528] Arrhythmias represent an additional potential complication; a prospective PsA cohort followed from 1994 to 2024 assessed atrial tachyarrhythmia, ventricular tachyarrhythmia and bradycardia requiring pacing, with analyses relating arrhythmia risk to PsA disease activity. [119]B2b
Treatment-related CV concerns are particularly relevant to Janus kinase inhibitors (JAK inhibitors). Regulatory warnings include major adverse cardiovascular events, venous thromboembolism and malignancy, and a prospective exploratory study specifically evaluated early myocardial deformation after upadacitinib initiation in adults with immune-mediated inflammatory diseases, including PsA. [550]C The available evidence does not establish that upadacitinib causes early myocardial injury, but it supports individualized CV-risk assessment and monitoring. [550]C A systematic review and Bayesian network meta-analysis of randomized trials and long-term extensions was undertaken to estimate comparative and absolute cancer risk for JAK inhibitors versus other advanced therapies across immune-mediated inflammatory diseases, including PsA and psoriasis. [525]
Infection and vaccination-related complications
Immune dysregulation and immunosuppressive treatment increase infection concerns in inflammatory arthritis. [596] IL-23 inhibitors—including guselkumab, risankizumab and tildrakizumab—were systematically reviewed for new tuberculosis (TB) infection and latent TB infection (LTBI) reactivation in psoriasis and PsA, with particular attention to high-prevalence Asia-Pacific settings. [112]B2a In pooled phase 2/3 studies of guselkumab involving LTBI-positive patients with psoriasis or active PsA, treatment was evaluated for safety for up to 5 years; the analysis reflects updated practice in which routine LTBI testing is not universally required before IL-17 or IL-23 inhibitor therapy, unlike the established concern with TNF inhibitors. [553]
Herpes zoster is an important treatment-related complication of JAK inhibition. A real-world cohort of patients with inflammatory diseases, including PsA, treated with upadacitinib, baricitinib or tofacitinib measured incident herpes zoster, incidence rates and associated factors, while also assessing zoster-vaccine uptake. [534] Recommended preventive vaccination in inflammatory arthritis includes shingles, influenza, COVID-19 and pneumococcal vaccines, although uptake across these vaccines remained inconsistent in a three-centre UK study of patients with rheumatoid arthritis, PsA and ankylosing spondylitis. [596] COVID-19 is also relevant during advanced therapy: in integrated bimekizumab safety analyses comprising 1,409 PsA patients and 3,655.9 patient-years of exposure, COVID-19 was among the most frequent treatment-emergent adverse events; discontinuation because of adverse events was infrequent at 2.9 per 100 patient-years. [592]
Malignancy and organ-specific safety
Cancer risk should be considered when selecting advanced therapy, particularly JAK inhibitors, because class-wide regulatory warnings followed evidence from rheumatoid arthritis surveillance and the comparative risk across immune-mediated diseases remains uncertain. [525] Current evidence should therefore be interpreted by drug, patient risk profile, smoking history, age and comorbidity rather than assuming identical risk across all advanced therapies. [525]
Autoimmune thyroid disease is not established as a characteristic PsA complication by the cited evidence. However, a systematic Mendelian-randomization review reported associations between autoimmune thyroid disease and multiple health outcomes, including coronary atherosclerosis, deep venous thrombosis and chronic obstructive pulmonary disease; these genetic findings do not by themselves demonstrate that PsA or its treatment causes thyroid disease. [430]A1a
Bone, hepatic and perioperative complications
Psoriasis is associated with increased osteoporosis risk, and a 2026 retrospective cohort of 639 patients developed and validated a nomogram to identify patients at high risk, using dual-energy X-ray absorptiometry and T-score ≤ −2.5 as the osteoporosis definition. [531] In patients requiring total hip arthroplasty, a national claims analysis compared complications and implant survivorship in inflammatory-arthritis patients receiving DMARDs with those not receiving DMARDs. [577] A separate large database study evaluated superficial and deep surgical-site infection, 90-day sepsis and 2-year revision after hip arthroplasty in patients with cutaneous psoriasis or PsA compared with patients without psoriasis. [546]C
LTBI chemoprophylaxis may itself cause harm. In a single-centre series and literature review of patients with autoimmune rheumatic diseases who developed isoniazid hepatotoxicity, 56.3% had spondyloarthritis or PsA; hepatotoxicity was defined using elevations of at least twofold above the upper limit of normal in the reported clinical analysis. [594] Liver history and concurrent hepatotoxic drugs should therefore be reviewed before and during isoniazid therapy. [594]
Disease flares and new-onset disease signals
A nested case-control study evaluated whether SARS-CoV-2 exposure or COVID-19 vaccination was associated with development of PsA in a healthcare-provider database of 3,122,602 adults without prior PsA, with cases identified from January 2021 through June 2022. [439]B3b Separately, a propensity-matched electronic-health-record cohort compared new-onset psoriasis within 3 months after confirmed COVID-19 infection without vaccination versus vaccination without prior infection. [595] These observational studies address temporal associations and should not be interpreted as proof of causation or as evidence that vaccination routinely induces PsA or psoriasis. [439]B3b[595]
| Domain | Evidence and clinical implication |
|---|---|
| Cardiovascular | Prospective 10-year event rate 1.33/100 patient-years; assess risk factors, disease activity and vascular disease. [593][591][444]C4 |
| Arrhythmia | Atrial, ventricular and bradyarrhythmic outcomes have been prospectively evaluated in PsA. [119]B2b |
| Infection | TB/LTBI, herpes zoster and COVID-19 are key concerns; risk varies by therapy. [112]B2a[553][534][592] |
| Malignancy and JAK safety | Comparative cancer, MACE and VTE risk remain central to JAK-inhibitor selection. [525][550]C |
| Bone and surgery | Osteoporosis and postoperative infection, sepsis and revision require risk assessment. [531][546]C[577] |
| Hepatic toxicity | Isoniazid prophylaxis may produce clinically relevant hepatotoxicity. [594] |
History and Evolution of Treatment
- ▸Modern PsA treatment has progressed from conventional DMARDs and TNFi toward IL-17, IL-23, and JAK-directed therapies, with treatment selection increasingly structured around disease domains and prior response. [456][540]
- ▸The 2025 French guidelines identify **MTX, adalimumab, or ustekinumab** as primary systemic options for adults with moderate-to-severe psoriasis and incorporate newer systemic therapies. [456]
- ▸Secukinumab, approved for moderate-to-severe psoriasis in **2015**, has accumulated long-term clinical and real-world evidence, including up to **7 years** of follow-up. [117][597]
- ▸Bimekizumab provides dual **IL-17A/IL-17F** inhibition, with efficacy and safety evaluated through **3 years** in biologic-naive and TNFi-inadequate-response PsA populations. [83][592]
- ▸The treatment field is moving toward earlier intervention, prevention of progression from oligoarticular to polyarticular disease, and biomarker-guided therapeutic selection. [539][540][360]
From symptom control to disease modification
Treatment for psoriatic arthritis (PsA) has evolved from conventional symptom-oriented management toward early, targeted disease modification across peripheral joints, entheses, skin, and axial disease. Contemporary therapeutic classes include conventional synthetic disease-modifying antirheumatic drugs (csDMARDs), biologic DMARDs (bDMARDs), and targeted synthetic DMARDs (tsDMARDs), with methotrexate (MTX), tumour-necrosis-factor inhibitors (TNFi), interleukin (IL)-17 and IL-23 inhibitors, and Janus kinase (JAK) inhibitors represented in current clinical studies and guidelines. [456]A1c[540]
The updated 2025 French systemic-therapy guidelines illustrate the move toward structured treatment algorithms rather than a single universal sequence. For adults with moderate-to-severe psoriasis, including those with PsA, the working group identifies MTX, adalimumab, or ustekinumab as primary systemic options, while incorporating established and emerging therapies into subsequent decision-making. [456]A1c This approach reflects the need to select treatment according to both musculoskeletal and cutaneous disease, although the abstract does not provide a complete PsA-specific sequencing algorithm. [456]A1c
Expansion of biologic treatment
TNFi were among the established biologic strategies for inflammatory arthritis, and adalimumab remains one of the primary systemic options identified in the 2025 French guidance. [456]A1c Comparative contemporary research continues to evaluate TNFi against newer targeted therapies; in the TOFA-PREDICT trial, DMARD-naive patients were randomized to tofacitinib or MTX, whereas patients with inadequate response to csDMARDs were randomized to tofacitinib or etanercept. [540] This trial reflects the transition from conventional treatment escalation to comparative, mechanism-directed selection.
IL-17 pathway inhibition subsequently broadened treatment options. Secukinumab was approved for moderate-to-severe psoriasis in 2015, and long-term observational and clinical-program data have evaluated sustained effectiveness and safety in psoriatic disease. [117]B3b[597] In the ULTIMATE study, secukinumab was assessed against placebo in patients with PsA and active clinical and power-Doppler-ultrasound synovitis; post-hoc analyses examined whether ultrasound-defined inflammatory clusters followed different response trajectories. [163]A1b These studies represent a shift toward objective imaging of inflammation and assessment of treatment response beyond joint counts alone. [163]A1b
Bimekizumab expanded IL-17 blockade by inhibiting IL-17A and IL-17F. Three-year results from BE OPTIMAL in biologic-naive patients and BE COMPLETE in patients with prior TNFi inadequate response or intolerance evaluated subcutaneous bimekizumab 160 mg every 4 weeks, demonstrating continued assessment of efficacy and tolerability in both treatment-naive and difficult-to-treat populations. [83]B2b Integrated phase IIb/III safety analyses included 1,409 patients with PsA and 3,655.9 patient-years of exposure; treatment-emergent adverse events and discontinuations because of adverse events were quantified using exposure-adjusted incidence rates. [592]
Other IL-17-directed agents are entering the evidence base. A phase 2 randomized trial evaluated subcutaneous vunakizumab, an IL-17A monoclonal antibody, at 120 mg or 240 mg versus placebo in adults with active PsA, with placebo participants switching to active treatment at week 12. [348]A1b Ixekizumab is also being studied in children with active juvenile PsA and enthesitis-related juvenile idiopathic arthritis, using adalimumab as a randomized reference treatment in an ongoing phase 3 study. [201]A1b
IL-23 inhibition and treatment after TNFi failure
IL-23p19 inhibition represents another major development in targeted therapy. Guselkumab was evaluated in SOLSTICE in adults with active PsA and inadequate response, intolerance, or inadequate efficacy to one prior TNFi. Participants received guselkumab 100 mg every 4 weeks or an induction regimen followed by every-8-week dosing, compared with placebo. [353]A1b Safety data pooled from 11 studies also examined guselkumab in patients with latent tuberculosis infection, supporting evaluation of IL-23 inhibition in populations for whom TNFi-associated tuberculosis risk is a particular concern. [553]
Earlier intervention and disease modification
The modern treatment goal increasingly includes preventing progression rather than treating established polyarticular disease alone. FOREMOST enrolled 308 patients with early PsA of approximately 9.9 months’ mean duration and limited disease, defined as more than 1 and up to 4 swollen and tender joints. Participants were randomized to apremilast or placebo for 24 weeks, followed by open-label apremilast through week 48, to study progression from oligoarticular to polyarticular disease and whether apremilast modifies that course. [539]
Toward precision treatment and broader outcomes
Current research is moving toward biologically informed treatment selection. TOFA-PREDICT evaluates circulating immune-cell biomarkers associated with clinical manifestations and response to tofacitinib, MTX, or etanercept, while integrative transcriptomic and proteomic analyses seek predictive profiles for tofacitinib and comparator treatments. [540][360]B2b Upadacitinib has also been compared with adalimumab for pain outcomes in phase 3 PsA analyses, including assessment of improvement in patients with and without attenuation of inflammation. [453]A1b
Treatment evolution also includes long-term effectiveness, safety, and special-population considerations. Secukinumab has been followed for up to 7 years in real-world psoriasis cohorts, and SERENA provides up to 5 years of observational data across psoriatic disease populations. [117]B3b[597] Late-onset PsA, defined as onset at ≥60 years, comprised 16% of a nationwide cohort, emphasizing the need to consider age-specific treatment patterns and outcomes. [599]C Ketamine infusions have been retrospectively examined for severe chronic arthritis pain, including PsA, but the study was a small cohort of 38 patients and does not establish ketamine as a disease-modifying PsA therapy. [554]C Finally, immune-checkpoint-inhibitor therapy in patients with pre-existing rheumatologic disease has prompted evaluation of flare risk, an increasingly relevant treatment-context issue in oncology. [327]A1a
| Treatment-development stage | Representative evidence | Clinical significance |
|---|---|---|
| Conventional systemic therapy | MTX remains a primary systemic option in updated French guidance. [456]A1c | Establishes the csDMARD foundation. |
| TNF inhibition | Adalimumab is a primary systemic option; etanercept is used as a comparator in TOFA-PREDICT. [456]A1c[540] | Provides established biologic therapy and a benchmark for newer agents. |
| IL-17 inhibition | Secukinumab, bimekizumab, ixekizumab, and investigational vunakizumab are represented in current evidence. [117]B3b[83]B2b[201]A1b[348]A1b | Expands targeted treatment across adult and pediatric PsA. |
| IL-23 inhibition | Guselkumab was studied after inadequate response to one TNFi and in latent-TB-positive populations. [353]A1b[553] | Supports treatment options after TNFi failure and in selected safety contexts. |
| Precision and early disease modification | FOREMOST evaluates early oligoarticular PsA; TOFA-PREDICT evaluates biomarkers of response. [539][540] | Shifts emphasis toward prevention of progression and personalized treatment. |
Prognosis & Natural History
- ▸Early oligoarticular disease is not necessarily stable: FOREMOST specifically evaluated progression from **≤4** to **>4 active joints** in patients with early PsA. [539]
- ▸Radiographic damage can occasionally decrease at the joint level, although repair does not establish complete structural recovery or absence of active disease. [253]
- ▸Residual pain, fatigue and other symptoms may persist despite achievement of a formal treatment target. [527]
- ▸BMI, comorbidities and treatment class may influence the likelihood of achieving minimal disease activity, but the available evidence is primarily observational. [557]
- ▸After TNF-inhibitor failure, both cycling and switching to a different mechanism are clinically relevant strategies; comparative evidence includes 12- and 24-month retention outcomes. [242]
- ▸Biomarker and transcriptomic predictors of response are promising but remain exploratory and are not yet validated for routine individual treatment selection. [540][542]
- ▸In juvenile populations treated with etanercept, approximately two-thirds achieved clinically inactive disease and 34–43% achieved clinical remission in long-term CLIPPER studies. [241]
Overview
Psoriatic arthritis (PsA) has a heterogeneous, multidomain course involving peripheral joints, entheses, axial structures, skin and associated symptoms; prognosis therefore depends on the affected domains, baseline damage, comorbidity burden, treatment response and durability. [527][544] Contemporary trials increasingly use composite outcomes to capture disease activity across these domains, and a GRAPPA-OMERACT systematic review and network meta-analysis is evaluating which measures most effectively distinguish biologic or targeted synthetic DMARDs from placebo. [292]A1a
Early disease and progression
In early PsA with limited joint involvement, progression from oligoarticular disease—defined in FOREMOST as ≤4 active joints—to polyarticular disease—defined as >4 active joints—is a clinically important outcome. [539] FOREMOST enrolled 308 patients with early PsA, with a mean disease duration of 9.9 months, and prospectively assessed progression at week 16 while evaluating apremilast versus placebo. [539] The study specifically modelled baseline predictors of progression and the potential disease-modifying effect of apremilast; therefore, early limited-joint disease should not automatically be regarded as permanently mild or non-progressive. [539]
Patients with psoriasis may also develop PsA after a clinically musculoskeletal prodrome or subclinical entheseal abnormalities. [552][254]B2b In the EPOS study, psoriasis patients without previous or current PsA but with arthralgia and MRI or high-resolution peripheral quantitative CT evidence of subclinical entheseal inflammation or structural bone change received apremilast for 24 weeks; the study examined whether treatment altered entheseal bone damage. [552] A population-based cohort of 2,819 psoriasis patients initiating biologic therapy evaluated incident PsA according to biologic class and treatment line, including TNF, IL-17, IL-23p19 and IL-12/23 inhibitors, with particular attention to second-line therapy. [254]B2b These studies address risk modification and subclinical disease, but do not establish that any biologic class prevents PsA in routine practice. [254]B2b[552]
Structural damage and reversibility
Radiographic damage remains a relevant long-term prognostic domain, although repair may occur in some joints. [253]B2b In a cohort of 674 patients, biennial hand and foot radiographs were scored using the modified Steinbrocker score, and repair was defined as a decrease in joint-level score; multistate Markov models were used to estimate transitions between damage states and identify prognostic factors. [253]B2b The existence of radiographic repair does not imply restoration of normal joint structure or absence of ongoing disease, and the frequency and predictors of repair should be interpreted within the limitations of cohort evidence. [253]B2b
Whole-body MRI provides evidence that inflammatory burden may extend beyond clinically apparent sites. [162]C4 In the 48-week MOSAIC phase 4 study, apremilast, with or without stable methotrexate, was assessed using MRI of the clinically most affected hand and whole-body MRI at baseline, week 24 and week 48, including peripheral joints and entheses, spine, sacroiliac joints, hips, knees and heel entheses. [162]C4 These data support assessment of both peripheral and axial inflammation when estimating disease burden, but the single-arm, open-label design limits causal conclusions about long-term structural prognosis. [162]C4
Residual disease and functional prognosis
Achieving a formal treatment target does not necessarily eliminate clinically important symptoms. [527] A systematic review and meta-analysis defined residual disease as clinically relevant signs or symptoms despite attainment of a treatment target and evaluated findings such as swollen joints and fatigue across inflammatory arthritis, including PsA. [527] Consequently, prognosis should incorporate patient-reported pain, fatigue and function in addition to joint counts and composite activity scores. [527]
Obesity may adversely influence the probability of achieving minimal disease activity. [557] In the longitudinal Gladman Krembil PsA Program cohort, BMI was evaluated against minimal disease activity and its individual components over time, with adjustment for demographic factors, anxiety or depression, fibromyalgia, smoking, treatment type and radiographic damage; analyses also compared six advanced-therapy classes. [557] This supports considering BMI and related comorbidities when estimating treatment response, while observational associations cannot prove that weight reduction alone changes PsA outcomes. [557] A 2026 review found vitamin D deficiency to be highly prevalent across inflammatory rheumatic diseases and critically assessed associations with disease activity, immunomodulatory mechanisms and supplementation; it does not establish vitamin D supplementation as a disease-modifying intervention in PsA. [600]
Treatment response, persistence and long-term control
Failure of an initial TNF inhibitor does not dictate a single subsequent treatment pathway. [242]A1a A systematic review and meta-analysis comparing cycling to another TNF inhibitor with swapping to a different mechanism evaluated lack of response, 12-month and 24-month retention, and adverse events in patients after primary TNF-inhibitor failure. [242]A1a Real-world persistence is also informative but reflects effectiveness, tolerability and patient or clinician preference rather than efficacy alone. [562] In the multicentre BIRRA cohort, treatment persistence with upadacitinib was compared with tofacitinib and predictors of discontinuation were examined using routine-care data. [562] Another multicentre real-world cohort compared retention of TNF inhibitors and IL-23 inhibitors across 1,418 treatment lines, addressing durability of these mechanisms in clinical practice. [184]C4
Potential predictors of individual response remain under development. [540][542][259]B3b In the TOFA-PREDICT development cohort of 80 patients, circulating immune-cell biomarkers were examined for associations with clinical manifestations and achievement of minimal disease activity at week 16 after tofacitinib, methotrexate or etanercept. [540] Transcriptomic profiling in 13 secukinumab-treated patients compared baseline and 3-month blood RNA expression in extreme response phenotypes, providing exploratory response-associated pathways rather than validated clinical prediction rules. [542] Lower CRP-albumin-lymphocyte index values were associated with higher disease activity in a retrospective cohort of 150 patients with PsA compared with 50 matched controls, but this index is not established as a replacement for validated activity measures. [259]B3b
Special populations and safety considerations
In juvenile PsA and related juvenile idiopathic arthritis populations treated with etanercept, approximately two-thirds achieved clinically inactive disease at some point and 34–43% achieved clinical remission, defined as at least six months of inactive disease, in the CLIPPER/CLIPPER2 studies; predictors were assessed over a 2-year study and an 8-year extension. [241]B2b Severe chronic pain may persist despite anti-inflammatory treatment, but evidence for repeated single-day intravenous ketamine is limited to a retrospective cohort of 38 patients with rheumatoid arthritis, osteoarthritis or PsA and cannot establish PsA-specific long-term benefit. [554]C For patients receiving guselkumab, pooled data from 11 psoriasis or PsA studies followed latent-tuberculosis-infection-positive participants for up to five years and evaluated tuberculosis-related safety, informing treatment safety rather than natural-history prognosis. [553]
Practical prognostic summary
Early oligoarticular PsA can progress to polyarticular disease, structural damage may accumulate but can occasionally show radiographic repair, and residual symptoms may remain despite low disease activity or remission. [539][253]B2b[527] Prognostic assessment should therefore be multidomain and longitudinal, incorporating joint and entheseal activity, axial symptoms, imaging, skin disease, fatigue, obesity and treatment persistence. [162]C4[527][557][544]
| Domain | Evidence relevant to prognosis | Main limitation |
|---|---|---|
| Peripheral disease progression | Progression from ≤4 to >4 active joints was studied prospectively in early PsA; apremilast was evaluated as a possible disease modifier. [539] | Follow-up and endpoint definitions are study-specific. [539] |
| Structural damage | A cohort of 674 patients assessed radiographic repair using biennial hand and foot radiographs and multistate models. [253]B2b | Cohort evidence cannot determine treatment causality. [253]B2b |
| Residual disease | Systematic review evidence shows that clinically relevant symptoms may remain despite target attainment. [527] | Definitions and instruments varied across studies. [527] |
| Treatment durability | Cycling versus swapping after TNF-inhibitor failure, TNF versus IL-23 inhibition, and upadacitinib versus tofacitinib persistence have been evaluated. [242]A1a[184]C4[562] | Real-world retention is influenced by effectiveness, tolerability and treatment preference. [562] |
| Response prediction | Immune-cell, transcriptomic and blood-derived indices have been associated with response or activity. [540][542][259]B3b | Biomarkers require external validation before routine use. [540][542][259]B3b |
Special Populations, Pregnancy & Prevention
- ▸Guselkumab is FDA-approved in the United States for pediatric plaque psoriasis and active juvenile PsA, with jPsA support based substantially on extrapolation from adult PsA and pediatric psoriasis evidence. [490]
- ▸Pediatric systemic psoriasis experience includes acitretin, methotrexate and cyclosporine; comparative real-world evidence comes from the 506-patient, 30-center ACMe cohort. [498]
- ▸The 2025 French guideline update lists methotrexate, adalimumab and ustekinumab among primary systemic options for adults with moderate-to-severe psoriasis and PsA. [456]
- ▸The supplied references contain no direct pregnancy or lactation safety dataset; reproductive decisions require specialist review and current product labeling. [456] [490]
- ▸Cardiovascular-risk prevention and screening should be integrated into PsA management because chronic inflammatory rheumatic disease is associated with increased cardiovascular risk. [591]
- ▸Herpes-zoster prevention and vaccination review are especially important during JAK-inhibitor treatment. [534]
- ▸Observational COVID-19 studies do not establish that infection or vaccination causes PsA or contraindicate vaccination. [439] [595]
Children and adolescents
Juvenile psoriatic arthritis (jPsA) shares important clinical and pathogenic features with adult PsA and psoriasis, including a central role for interleukin-23 signaling, but age and symptom sequence differ. [490]D5 Guselkumab, a fully human interleukin-23p19 inhibitor, has demonstrated efficacy and safety in adult psoriasis and PsA and consistent benefits in pediatric psoriasis; these data were extrapolated to jPsA and supported the recent US FDA approval of guselkumab for pediatric plaque psoriasis and active jPsA. [490]D5 This evidence is based on extrapolation rather than a large, direct randomized jPsA trial, so treatment should remain specialist-led with age-appropriate assessment of growth, development, ocular disease, enthesitis, dactylitis, skin involvement and functional impact. [490]D5
Adalimumab remains an established pediatric option for PsA and related inflammatory disease, but some children lose response to every-other-week treatment. [602]C In a very small retrospective series of four children with PsA or non-infectious uveitis, escalation to weekly subcutaneous adalimumab was evaluated for clinical and pharmacokinetic outcomes; the sample size prevents reliable generalization. [602]C Conventional systemic psoriasis options in children include acitretin, methotrexate and cyclosporine, although access to newer agents varies by country. [498]B3b In the international ACMe retrospective cohort, 506 children received 683 treatments across 30 centers between 2014 and 2024; the study compared 2-year drug survival for these agents but does not establish a universal first-line treatment for pediatric PsA. [498]B3b
Adults: systemic treatment and sex-related considerations
The 2025 French psoriasis guideline update proposes treatment algorithms for adults with moderate-to-severe plaque psoriasis and PsA. [456]A1c The working group identifies methotrexate, adalimumab or ustekinumab as primary systemic treatment options, while incorporating established and emerging therapies into individualized strategies. [456]A1c Selection should account for musculoskeletal phenotype, psoriasis burden, comorbidities, previous treatment exposure, reproductive plans and patient preference; the supplied guideline abstract does not provide pregnancy-specific drug recommendations. [456]A1c
Treatment response may differ by sex. [603]C In a retrospective cohort of 134 patients initiating biologics, including 87 men and 47 women, the investigators assessed 52-week articular and cutaneous outcomes and longer-term persistence. [603]C Previous registry and real-world observations summarized by the authors suggest that women may report greater pain, lower treatment response and shorter drug survival, although this does not justify withholding biologic therapy from women. [603]C Disease activity and treatment response should therefore be assessed using both objective inflammatory findings and patient-reported symptoms. [603]C
Pregnancy and reproductive planning
None of the supplied references provides direct pregnancy, lactation, fetal-safety or preconception outcome data for PsA therapies. [456]A1c [490]D5 [498]B3b [602]C Consequently, pregnancy decisions should not be inferred from the pediatric extrapolation of guselkumab or from adult treatment algorithms. [456]A1c [490]D5 Before conception, clinicians should document disease activity, review all systemic and targeted therapies, and coordinate rheumatology, dermatology and obstetric care; the specific medication plan must follow current product labeling and specialist guidance because those details are not supplied in the cited evidence. [456]A1c
Cardiovascular and metabolic prevention
PsA is part of a group of chronic inflammatory rheumatic diseases associated with increased cardiovascular disease risk and related morbidity and mortality. [591] The 2026 Austrian consensus was developed to provide practical prevention, screening and management recommendations for RA, PsA and spondyloarthritis, reflecting the need for routine cardiovascular-risk assessment rather than reliance on inflammatory symptoms alone. [591] Risk-factor review should include blood pressure, lipid abnormalities, diabetes, adiposity, smoking, physical inactivity and family history, with management integrated into PsA care. [591] Cross-sectional PSOCADIA data in psoriasis further evaluated cardiometabolic factors, echocardiographic abnormalities and myocardial dysfunction, underscoring the systemic relevance of inflammatory skin disease; these findings do not establish that echocardiographic screening should be performed routinely in every PsA patient. [528]
Genetic Mendelian-randomization evidence suggests that circulating nutrient traits may have causal relationships with PsA, but the supplied abstract does not identify a validated preventive diet or therapeutic nutrient intervention. [61]B2c Nutritional counseling should therefore emphasize general cardiometabolic health rather than unproven supplements or restrictive diets. [61]B2c Evidence from autoimmune-thyroid-disease Mendelian-randomization studies links autoimmune thyroid disease with several health outcomes, including coronary atherosclerosis and deep venous thrombosis, but this does not demonstrate a PsA-specific thyroid-screening strategy. [430]A1a
Infection prevention, vaccination and surgery
Patients receiving JAK inhibitors require particular attention to herpes-zoster prevention. [534] A 2026 real-world cohort evaluated herpes-zoster incidence, associated factors and vaccination uptake among patients with immune-mediated inflammatory diseases, including PsA, treated with upadacitinib, baricitinib or tofacitinib. [534] Vaccination status should be reviewed before and during JAK-inhibitor therapy, with risk-based use of recombinant zoster vaccination according to local recommendations; the supplied abstract does not provide a universal timing schedule. [534]
Available observational evidence does not establish that SARS-CoV-2 infection or vaccination causes PsA. [439]B3b In a nested case-control study from a cohort of 3,122,602 adults without PsA, exposure to infection and COVID-19 vaccination was evaluated in relation to incident PsA, but observational associations cannot prove causation. [439]B3b Similarly, a large electronic-record study compared new-onset psoriasis after confirmed infection without vaccination versus vaccination without prior infection; this addresses psoriasis rather than PsA and should not be used to infer vaccine contraindications. [595]
For arthroplasty, PsA and psoriasis are associated with concern for infection and postoperative complications, and perioperative planning should involve the surgical and rheumatology teams. [546]C [563]C Studies have examined superficial and deep surgical-site infection, 90-day sepsis, revision, disease activity and DMARD exposure after hip or knee replacement, but the supplied abstracts do not provide a single PsA-specific perioperative stopping or restarting rule. [546]C [563]C [577] Decisions should therefore be individualized according to infection risk, disease activity, procedure type and the specific DMARD.
| Population or issue | Evidence-supported action | Important limitation |
|---|---|---|
| Juvenile PsA | Consider approved specialist therapies, including guselkumab where locally authorized; assess joints, skin and function. [490]D5 | jPsA evidence for guselkumab is substantially extrapolated. [490]D5 |
| Pediatric psoriasis/systemic therapy | Acitretin, methotrexate and cyclosporine have international real-world drug-survival data. [498]B3b | No universal pediatric PsA treatment sequence is established by the cited cohort. [498]B3b |
| Pregnancy/lactation | Perform preconception medication review and multidisciplinary planning. [456]A1c | No pregnancy-specific safety outcomes are provided in the supplied references. [456]A1c |
| Cardiovascular prevention | Screen and manage modifiable cardiovascular risk factors. [591] | Routine echocardiography for all PsA patients is not established by the cited data. [528] |
| JAK-inhibitor therapy | Review herpes-zoster vaccination and infection risk. [534] | The abstract does not specify a universal vaccination schedule. [534] |
| Arthroplasty | Coordinate perioperative DMARD and infection-risk planning. [546]C [563]C [577] | No single PsA-specific perioperative medication rule is provided. [546]C [563]C [577] |
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