Joint Evaluation

Disclosed herein is a method for evaluation knee stiffness and knee damping. The method may include the steps of releasing a subject's leg from an extension position to allow the leg to oscillate under gravity, tracking a knee angle and at least one joint motion characteristic during the oscillation, determining a knee joint torque and a knee gravitational moment from the knee angle and the joint motion characteristic, and determining a knee stiffness and a knee damping from the joint torque and the knee gravitational moment.