The mechanisms for non-contact ACL injury is a matter of controversy and several theories have been proposed, principally the quadriceps drawer hypothesis (the quadriceps muscle generates anterior shear forces on the tibia due to the patellar tendon angle), internal rotation (internal tibial rotation on a relatively straight leg), valgus in combination with external rotation (knee valgus collapse with external rotation, which might involve impingement of the ACL against the intercondylar notch) and tibiofemoral compression (tibiofemoral compression loading displaces the femur posteriorly relative to the tibia). A precise description of the injury mechanism is critical to be able to target intervention programs to prevent ACL injuries. Furthermore, our knowledge on the risk factors for ACL injuries is limited. However, the literature strongly suggests that motion patterns are important.  Optimizing sidestep cutting technique is therefore crucial.   
　This lecture will give an update on the present knowledge on ACL injury mechanisms with a special focus on video analysis. A new hypothesis for the mechanisms of non-contact ACL injury is proposed. Moreover, a new study on the effect of technique on knee valgus moments will be presented. Finally, the use of simple clinical screening tests to identify players at risk will be discussed.

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