 Rationale Aim 1 Knee external abduction moment LOAD and lateral trunk motion LTM are known to be strong predictors of ACL injury risk in female athletes, but it is not known whether these predictors are linked and which athletes are at increased risk. In addition, we do not know the specific neuromuscular mechanisms that predispose these athletes to greater risk of injury. Neuromuscular control of the trunk will be examined relative to GRF position and magnitude, hip torque and knee LOAD. We will determine if increased ΔGRFv and increased relative hip adductor torque HAdT underlie increased knee LOAD in females. 