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Duke Orthopaedics
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Wheeless' Textbook of Orthopaedics

Mechanism of ACL Tear

- See: Biomechanical Role:

- Discussion:
    - ACL tears most often occur during football and basketball in younger patients, and occur most often from skiing injuries in older patients;
    - substantial anterior tibial shear forces that stress ACL are produced from quadriceps contraction, esp in 0-30 deg of extension;
    - typically, the ACL is torn in a noncontact deceleration situation that produces a valgus twisting injury;
            - this usually occurs when the athlete lands on the leg and quickly pivots in the opposite direction. (see pivot shift)
    - mechanisms reported as possibly able to disrupt ACL w/ minimal injury to other structures are:
            - hyperextension
            - marked internal rotation of tibia on femur;
            - pure deceleration



Association of Noncontact ACL Injury With Presence and Thickness of a Bony Ridge on the Anteromedial Aspect of the Femoral Intercondylar Notch 

Bone Contusion and Associated Meniscal and Medial Collateral Ligament Injury in Patients with Anterior Cruciate Ligament Rupture

An Association of Lateral Knee Sagittal Anatomic Factors with Non-Contact ACL Injury: Sex or Geometry

What Strains the Anterior Cruciate Ligament During a Pivot Landing?



Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, March 15, 2012 10:04 am