Effects of knee extensor moment biofeedback on gait biomechanics and quadriceps contractile behavior

We tested the efficacy of real-time biofeedback to augment peak knee extensor moment (KEM) during walking, an outcome relevant to the development of posttraumatic osteoarthritis (PTOA) following knee injury. Subjects averaged changes in peak KEM up to +62% and -57% of normal values, with concomitant and potentially favorable changes in knee flexion excursions during weight acceptance. In addition, VL muscle fascicles accommodated weight acceptance in walking largely through isometric rather than the eccentric action commonly presumed.