Speed | Toe-off angle (deg) | Ankle net work (J/kg) | Peak ankle power (W/kg) |
---|
(m/s) | Control | Powered | Control | Powered | Control | Powered |
---|
0.75 | 12.0 ± 4.6 | 13.2 ± 2.5 | -0.03 ± 0.08 | 0.12 ± 0.06* | 1.4 ± 0.5 | 1.3 ± 0.3 |
1.00 | 15.3 ± 4.7 | 15.3 ± 2.3 | 0.02 ± 0.07 | 0.14 ± 0.07* | 2.2 ± 0.6 | 1.7 ± 0.4 |
1.25 | 16.8 ± 4.4 | 16.7 ± 1.9 | 0.07 ± 0.06 | 0.17 ± 0.09* | 2.8 ± 0.6 | 2.6 ± 0.4 |
1.50 | 18.2 ± 5.9 | 18.6 ± 1.6 | 0.12 ± 0.09 | 0.22 ± 0.07* | 3.4 ± 0.6 | 3.8 ± 0.5 |
1.75 | 19.1 ± 3.5 | 19.0 ± 1.2 | 0.16 ± 0.06 | 0.25 ± 0.08 | 4.2 ± 0.7 | 4.2 ± 0.6 |
- Average ± S.D. ankle angle at toe-off, net mechanical work during the entire stance phase, and peak mechanical power for subjects with an amputation using a powered ankle-foot prosthesis (Powered) compared to non-amputees (Control) across walking speeds. We used data from sensors within the prosthetic ankle to compute toe-off angle and net work from the powered prosthesis. We used inverse dynamics to compute data from non-amputees and peak power for both groups. * indicates a significant difference (P ≤ 0.05) between subjects with an amputation using the powered prosthesis and non-amputees.