Purpose This study identified kinematic and knee energetic variables that reduce the risk of
non-contact anterior cruciate ligament (ACL) injury during single-leg landings from
increasing vertical heights and horizontal distances. Methods Nine subjects performed
single-leg landings from takeoff platforms with vertical heights of 20, 40, and 60 cm onto a
force plate. Subjects also performed single-leg landings from a 40 cm high takeoff platform
placed at horizontal distances of 30, 50 and 70 cm from a force plate. Kinematic and kinetic …