Abstract Summary
Anterior cruciate ligament-deficient (ACL-D) individuals had a smaller total support moment (TSM) during stair descent compared to a control group. When examining joint components of the TSM, knee extensor and ankle plantarflexor moments were significantly reduced in the ACL-D group while the hip extensor moment was not. ACL-D individuals may avoid loading the knee in an attempt to promote stability. Rehabilitation for ACL deficiency should not be limited to the knee, but also consider normalizing ankle function.