Fig. 4

Representative plot of the affected side internal hip extension moment over the gait cycle for one subject at the slower walking speed (a). Solid and dotted lines represent the mean and standard deviation (±1 SD), respectively. Significant differences in the moments between the two knees tested are shown by the black points at the top of the plot. Affected side maximum terminal stance phase hip flexion moment, normalized to body weight, for walking at 1 m/s (b) and 1.25 m/s (c). Significant increases (p ≤ 0.05) in hip moment due to using the VI Knee compared to a C-Leg are denoted by stars