Development of a Mechanistic Hypothesis Linking Compensatory Biomechanics and Stepping Asymmetry during Gait of Transfemoral Amputees

Table 3

Interlimb external work on CoM for controls and two transfemoral amputees during the 0-100% gait cycle of slow, normal, and fast speed walking, with results from the single sample -test between amputee and sample of control subjects. Wp = positive work (J/kg); Wn = negative work (J/kg); Wt = total work (J/kg), where .

Work (J/kg)	Control subjects			Amputee: C-Leg/Mauch
	Mean/(SD)			Intact side			Prosthesis side
	Slow	Norm	Fast	Slow	Norm	Fast	Slow	Norm	Fast
Impulse
Wp	0.295 (0.061)	0.367 (0.078)	0.500 (0.138)	0.254	0.423	0.658^‡	0.108^†	0.126^†	0.234^†
				0.218^†	0.254^†	0.450	0.057^†	0.087^†	0.151^†
Wn	0.307 (0.046)	0.372 (0.074)	0.525 (0.125)	0.105^†	0.268^†	0.369^†	0.168^†	0.251^†	0.294^†
				0.069^†	0.130^†	0.572	0.156^†	0.184^†	0.134^†
Wt	0.602 (0.083)	0.739 (0.145)	1.024 (0.245)	0.359^†	0.691	1.027	0.276^†	0.377^†	0.528^†
				0.287^†	0.384^†	1.021	0.213^†	0.271^†	0.285^†
Gravity
Wp	0.320 (0.062)	0.354 (0.079)	0.442 (0.112)	0.249^†	0.320	0.402	0.238^†	0.297	0.348
				0.297	0.315	0.664^‡	0.264^†	0.378	0.303^†
Wn	0.281 (0.055)	0.327 (0.084)	0.402 (0.107)	0.277	0.350	0.492	0.224^†	0.289	0.289^†
				0.332^‡	0.341	0.455	0.261	0.413^‡	0.466
Wt	0.601 (0.105)	0.681 (0.154)	0.844 (0.210)	0.526	0.670	0.894	0.462^†	0.585	0.637^†
				0.629	0.656	1.119^‡	0.525	0.791	0.769

^†Significantly lower at ; ^‡Significantly higher at .