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Orthopedics›Condition·Updated Jul 11, 2026·v1

Anterior Cruciate Ligament Tear

Anterior cruciate ligament tear is a common knee injury in active populations, typically resulting from a non-contact pivot-shift mechanism. Management requires shared decision-making between operative reconstruction (which reduces secondary meniscal injury and restores stability) and nonoperative care (viable for low-demand patients). Diagnosis relies on history, physical exam (Lachman, pivot shift, Lever sign), and MRI. Rehabilitation focuses on criterion-based milestones including strength, hop testing, and psychological readiness before return to sport. Long-term osteoarthritis risk remains despite treatment.

High Evidence108 references·2,713 words·11 min read·v1
orthopedicsACL tearanterior cruciate ligamentknee injurysports medicineligament reconstructionmeniscal tearpivot shiftLachman test

Quick Reference

RxDrug of choiceNot applicable (no pharmacologic treatment); NSAIDs for acute pain and inflammation.
AltAlternativesGraft options: hamstring autograft, quadriceps autograft, bone-patellar tendon-bone autograft (allograft reserved for revision/older patients).
⊘AvoidEarly return to sport before achieving ≥90% limb symmetry index and psychological readiness; non-dihydropyridine CCBs (no role).
DxTest of choiceMRI (confirms tear, assesses chronicity, identifies associated injuries).
ScKey scoreLysholm knee score, Tegner activity scale, KOOS-QOL (minimal important change 18 points).
→When to referHigh-grade pivot shift, repairable meniscal tear, chondral injury, multi-ligament knee injury, high-demand athletes wishing to return to pivoting sports.
ACL tear is common in active individuals; management hinges on shared decision-making. Reconstruction improves stability and reduces secondary meniscal injury but does not prevent long-term osteoarthritis. Neuromuscular training cuts injury risk by 50%.
Anterior cruciate ligament (ACL) tear is a common knee injury, often from non-contact pivot-shift mechanisms, with incidence 68.6 per 100,000 person-years. It causes instability and often involves meniscal and chondral injuries. Classification guides treatment; diagnosis is clinical with MRI confirmation. Management ranges from nonoperative rehabilitation to surgical reconstruction, with outcomes influenced by patient factors and concomitant injuries. This summary condenses key clinical facts for bedside reference.

Overview and Recommendations

Background

  • •An ACL tear is a partial or complete disruption of the ligament connecting the femur to the tibia, most commonly occurring in the midsubstance via a non-contact deceleration, cutting, or landing maneuver that combines knee valgus, anterior tibial translation, and internal rotation. The incidence of ACL tears is 68.6 per 100,000 person-years, making it the most frequent ligament injury requiring surgical intervention in the active population.
  • •The injury is classified anatomically as proximal (femoral avulsion), midsubstance (most common), or distal (tibial avulsion), with midsubstance tears less amenable to primary repair. The BEAR classification (based on remaining tibial footprint and stump length) guides eligibility for bridge-enhanced ACL repair, while the Schenck system classifies multi-ligament knee injuries (MLKI) by number and pattern of torn ligaments.
  • •ACL tears are rarely isolated: concomitant meniscal tears occur in 65% of cases (more common in males), medial meniscal ramp lesions in 9-42%, and posterolateral tibial plateau impaction fractures in 49.3%. These associated injuries independently predict rotational instability, patient-reported outcomes, and long-term osteoarthritis risk.
  • •Post-traumatic osteoarthritis develops in approximately 20-30% of patients by 5-10 years regardless of surgical reconstruction, driven by the initial chondral injury and ongoing meniscal dysfunction. The pivot-shift mechanism that causes the ACL tear also produces characteristic bone bruises on the lateral femoral condyle (77%) and posterolateral tibial plateau (85%), which serve as imaging markers of the injury pattern.
  • •Neuromuscular risk factors include decreased quadriceps activation, increased vastus medialis-to-semimembranosus cross-sectional area ratio, and high serum relaxin concentration (>6.0 pg/mL) in elite female athletes. Anatomical risk factors such as increased posterior tibial slope, narrow intercondylar notch, and increased PCL volume (OR 9.01) can be identified on pre-participation screening MRI.

Evaluation

  • •Suspect an ACL tear when a patient reports a non-contact pivoting or deceleration injury with an audible pop, rapid hemarthrosis (within 2-4 hours), and a sense of knee instability or giving way. The knee is often swollen and tender along the joint line, with restricted range of motion due to effusion.
  • •Ask about the mechanism of injury (non-contact vs contact), immediate swelling, ability to bear weight, and any mechanical symptoms such as locking or catching that suggest a displaced meniscal tear. Inquire about prior knee injuries, activity level, and willingness to modify sports participation.
  • •Examine the knee systematically: perform the Lachman test (anterior translation at 20-30° flexion) as the primary screening tool (sensitivity 81%, specificity 85%), the pivot-shift test (the most specific test at 94% to rule in an ACL tear), and the anterior drawer test (sensitivity 83%, specificity 85%). The Lever sign (heel lift test) is the best test to rule out a tear (sensitivity 83%, specificity 91%).
  • •Assess for concomitant injuries: valgus stress testing at 20-30° to evaluate the medial collateral ligament (MCL), varus stress testing for the posterolateral corner (PLC), and dial test at 30° and 90° for PLC integrity. A positive pivot shift under anesthesia (grade ≥II) occurs in 55.8% of ACL-deficient knees and is associated with complete tear, MCL injury, and anterolateral complex injury.
  • •Order weight-bearing anteroposterior, lateral, and tunnel view radiographs to rule out fractures (Segond fracture, tibial spine avulsion, posterolateral tibial plateau impaction fracture) and assess for pre-existing osteoarthritis. Obtain MRI as the gold-standard imaging test to confirm the ACL tear, characterize tear chronicity, and identify associated injuries including meniscal tears, bone bruises, chondral lesions, and Kaplan fiber injuries.
  • •Diagnostic criteria are based on the combination of a compatible history, positive physical exam findings (especially a positive Lachman or pivot shift), and MRI confirmation of fiber discontinuity, abnormal signal, or abnormal course. Arthroscopy remains the gold standard for confirming partial tears and for definitive assessment of meniscal and chondral pathology.
  • •Also consider evaluating for meniscal ramp lesions (detachment of the posterior horn of the medial meniscus from the capsule) on MRI or arthroscopy, as these are present in 9-42% of ACL tears and increase anteroposterior and rotatory laxity. Bone bruising patterns (lateral femoral condyle, posterolateral tibial plateau) are nearly universal and help confirm the acute injury.
  • •In chronic ACL deficiency, assess for recurrent instability episodes, secondary meniscal tears, and quadriceps atrophy. Proprioception deficits are present (mean joint position sense error 0.94° greater than contralateral knee) and should be addressed in rehabilitation.

Management

  • •Initiate shared decision-making based on patient activity level, age, instability, and willingness to modify sport participation. For most active patients, ACL reconstruction (ACLR) reduces the risk of subsequent meniscal surgery and provides superior knee stability; nonoperative management with structured rehabilitation is reasonable for those willing to avoid pivoting sports and accept a higher risk of secondary injury.
  • •For nonoperative management, implement RICE (rest, ice, compression, elevation), analgesic and anti-inflammatory medication as needed, and bracing with a hinged knee brace locked in extension for weight-bearing until acute effusion resolves. Begin early phase 1 rehabilitation focusing on quadriceps activation, range of motion, and proprioceptive exercises.
  • •For operative management, proceed with ACLR using an autograft (hamstring, quadriceps, or bone-patellar tendon-bone) based on surgeon preference and patient factors. Hamstring autograft avoids anterior knee pain and yields comparable stability to patellar tendon grafts (side-to-side laxity improvement 4.7 ± 3.0 mm). Quadriceps autograft shows a trend toward faster return to sport (82 vs 95 days).
  • •Perform single-incision endoscopic reconstruction with anatomic tunnel placement to restore the native ACL footprint. Use interference screws for BTB grafts or suspensory fixation (e.g., EndoButton) for hamstring/quadriceps grafts. Graft tensioning at 20-30 N with the knee in full extension avoids over-constraint.
  • •Consider adding lateral extra-articular tenodesis (LET) or anterolateral ligament reconstruction (ALLR) in patients with high-grade pivot shift, revision surgery, or young athletes to reduce graft failure (OR 0.27) and improve rotational stability. Suture tape augmentation of hamstring autografts reduces failure rates from 8.5% to 3.1% (NNT 19).
  • •Timing of surgery: early ACLR within 12 weeks is recommended for patients with repairable meniscal tears, high-grade instability, or high-demand athletes to reduce the risk of secondary meniscal and chondral injuries. Delayed reconstruction after 6 weeks is acceptable for less severe injuries, allowing the acute inflammatory phase to subside and reducing arthrofibrosis risk.
  • •Postoperative rehabilitation proceeds through four phases: Phase 1 (weeks 0-2) focuses on controlling effusion, achieving full passive knee extension, and initiating quadriceps activation. Phase 2 (weeks 2-6) introduces closed-chain strengthening and weight-bearing as tolerated. Phase 3 (weeks 6-12) advances to open-chain exercise at 40-90° of flexion and balance training. Phase 4 (weeks 12-24) emphasizes sport-specific drills and agility.
  • •Weight-bearing progression: immediate full weight-bearing in a locked brace is permitted after isolated ACLR with hamstring autograft, progressing to full motion by week 4. If suture tape augmentation is used, early aggressive rehabilitation may be allowed. For patients with grade II valgus laxity, isolated ACLR alone restores medial stability in 90% of cases.
  • •Monitor for complications: 30-day complication rate after ACLR is 1.34%, with symptomatic DVT (0.55%) being most common. Graft failure occurs in 8.5% of nonaugmented hamstring autografts; smoking, dyspnea, and COPD are independent risk factors for overall complications. Long-term, radiographic osteoarthritis develops in ~20-30% of patients by 5-10 years.
  • •Return-to-sport criteria require limb symmetry index (LSI) ≥90% on quadriceps strength and single-leg hop testing, KOOS-QOL ≥53 (PASS) or Lysholm ≥90, and psychological readiness scores (ACL-RSI ≥70, Tampa Scale of Kinesiophobia <37). Avoid early return to sport; the strongest predictor of successful return is achievement of ≥90% LSI combined with psychological readiness.
  • •Refer to an orthopedic surgeon when there is high-grade pivot shift (grade ≥II), repairable meniscal tear, chondral injury requiring treatment, multi-ligament knee injury, or in high-demand athletes who wish to return to pivoting sports. Discharge criteria include successful return to desired activity level with stable knee and no functional limitations.
  • •What NOT to do: avoid non-dihydropyridine calcium channel blockers (diltiazem, verapamil), they have no role in ACL management. Avoid early return to sport before meeting objective strength and psychological criteria. Avoid routine use of allografts in young, active patients due to higher failure rates.

Board Review — High Yield

  • •Lachman test, most sensitive bedside test for ACL tear (81%); performed at 20-30° knee flexion.
  • •Pivot-shift test, most specific (94%) for ruling in ACL tear; positive test indicates rotational instability.
  • •Lever sign, best test to rule out ACL tear (sensitivity 83%, specificity 91%); heel lift test.
  • •Posterolateral tibial plateau impaction fracture, present in ~49% of ACL tears; type IIIB associated with worse outcomes.
  • •Meniscal ramp lesion, occurs in 9-42% of ACL tears; increases anteroposterior and rotatory laxity; up to 30% require repair.
  • •KANON trial, landmark RCT showing equivalent 5-year KOOS and OA rates between early ACLR and rehabilitation with optional delayed ACLR (51% crossed over).
  • •Graft inclination angle <17°, associated with increased risk of graft rupture on postoperative radiographs.
  • •Return-to-sport criteria, LSI ≥90% on quadriceps strength and hop testing, ACL-RSI ≥70, Tampa Scale <37.
  • •Serum relaxin concentration >6.0 pg/mL, 4.4-fold increased risk of ACL tear in elite female athletes.
  • •Neuromuscular training, reduces ACL injury incidence by ~50% (IRR 0.493); no single exercise component is superior.

Deep Dive — Evidence Details

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