Total knee force during landing phase of athletic tasks. Sum of the average translational components during each simulated task for the intact knee, anterior cruciate ligament (ACL)–isolated knee, and medial collateral ligament (MCL)–isolated knee. As noted in previous simulations of the stance phase of gait,43 the ACL and MCL offer limited contributions to joint restraint when compared with the total joint force. In 3 of 4 simulated tasks, the ACL had greater overall mechanical contributions than the MCL. DVJ, drop vertical jump