The corresponding initial knee power absorption wave (Figure 4-12, Point L) is consistent with a knee extensor moment and multaneously flexing knee. This is followed by a smaller knee power generation wave that is also consistent with the knee extensor moment and an extending knee motion This power absorption and generation may be associated with eccentric followed by concentric contraction of the knee extensors. Aside from the early extensor moment, knee moments during stance are remarkably small given the 5 to 10 degrees of knee flexion found during single support. Moreover, the mechanism that produces the significant