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Table 2 Maximum knee power during three sub-phases of gait normalized to body weight by prosthesis

From: Impact on gait biomechanics of using an active variable impedance prosthetic knee

Speed (m/s)   Pre-string power (W/kg) Initial string flexion power (W//kg) String extension power (W/kg)
Subject C-Leg VI Knee C-Leg VI Knee C-Leg VI Knee
1 S2 0.12 ± 0.02 0.16 ± 0.01 * −0.58 ± 0.05 −0.41 ± 0.05 0.01 ± 0.00 0.22 ± 0.10 *
S3 0.09 ± 0.02 0.95 ± 0.27 * −1.74 ± 0.29 −3.12 ± 0.43 * 0.20 ± 0.01 1.05 ± 0.08 *
S4 0.15 ± 0.03 0.32 ± 0.16 * −0.66 ± 0.11 −0.75 ± 0.10 0.14 ± 0.02 0.22 ± 0.03 *
S8 0.09 ± 0.04 0.48 ± 0.07 * −0.83 ± 0.09 −1.02 ± 0.09 * 0.25 ± 0.04 0.98 ± 0.07 *
S11 0.08 ± 0.03 0.49 ± 0.23 * −0.80 ± 0.09 −1.11 ± 0.20 * 0.19 ± 0.01 0.66 ± 0.06 *
1.25 S2 0.11 ± 0.02 0.13 ± 0.00 * −0.88 ± 0.16 −0.69 ± 0.09 0.01 ± 0.00 0.27 ± 0.02 *
S3 0.13 ± 0.02 0.86 ± 0.17 * −2.02 ± 0.11 −3.52 ± 0.12 * 0.20 ± 0.01 1.10 ± 0.07 *
S4 0.21 ± 0.10 0.27 ± 0.03 −1.07 ± 0.26 −1.10 ± 0.08 0.23 ± 0.01 0.28 ± 0.01 *
S8 0.20 ± 0.03 0.80 ± 0.12 * −0.98 ± 0.08 −1.21 ± 0.04 * 0.38 ± 0.02 0.96 ± 0.09 *
S11 0.09 ± 0.01 0.84 ± 0.39 * −1.47 ± 0.03 −1.45 ± 0.27 0.18 ± 0.01 0.71 ± 0.01 *
  1. Significant (p < 0.05) improvements are noted by an “*”, significant reductions are noted by a “