Fig. 2
From: Prosthetic energy return during walking increases after 3 weeks of adaptation to a new device
Mechanical power of lower extremity over gait cycle. Ensemble mean mechanical power curves are shown for the prosthetic foot (solid lines) and sound ankle-foot system (dashed lines). Curves are plotted as a percentage of prosthetic limb stride, with sound limb heel strike happening at approximately 51%. Mechanical power at the ankle-foot was calculated using a Unified Deformable segment model, and eventually integrated to calculate mechanical work. Knee and hip powers were calculated using a six-degree-of-freedom power analysis. Vertical lines indicate gait events: STO = Sound limb Toe-Off, SHS = Sound limb Heel Strike, PTO = Prosthetic limb Toe-Off