Effects of a powered ankle-foot prosthesis on kinetic loading of the unaffected leg during level-ground walking

Table 2 Dynamic behavior of the powered prosthesis

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.

ISSN: 1743-0003