Smale KB, et al. - In this study, researchers estimated the 2 novel measures and applied a third to resolve the alterations in dynamic knee joint control in relation to anterior cruciate ligament (ACL) status during dynamic movements by testing 20 cases pre- (ACLd) and 10-months post- (ACLr) ACL reconstructive surgery vs uninjured participant (CON). They observed significantly lower stiffness in ACLd (0.06 ± 0.01 Nm/kg/°) and ACLr (0.07 ± 0.02 Nm/kg/°) vs CON (0.08 ± 0.02 Nm/kg/°) during the side cut. They did not report differences in stiffness during the hop. They found no significant differences in the knee joint center excursion (KJCE) during the side cut, but KJCE was significantly greater during the hop in CON vs the ACLd.