Rupture of the anterior cruciate ligament (ACL) is one of the most debilitating, yet increasingly common injuries in high-level sports. Mechanically, an ACL rupture occurs when an excessive tension force is applied to the ACL (Yu & Garett, 2007). This normally involves a combination of anterior shear load on the tibia, valgus loading, tibial internal rotation and either small knee flexion angles (0-30°) or large knee flexion angles (90° and more), and angular velocities, respectively, and could be the result of intermuscular coordination (Prodromos, 2007; Hewett et al., 2005).