Lehmann J F, Price R, Boswell-Bessette S, Dralle A, Questad K, deLateur B J
University of Washington, Department of Rehabilitation Medicine, Seattle 98195.
Arch Phys Med Rehabil. 1993 Nov;74(11):1225-31.
This study compared the mechanical and biomechanical functions, metabolic demand, and shock absorption of two dynamic elastic response (DER) prosthetic foot designs with the SACH foot. Nine individuals who had undergone unilateral below knee amputation were studied. Mechanical properties of the feet were related to gait biomechanics. Forefoot compliance is greatest for the Flex Foot and least for the SACH foot, hence, Flex Foot demonstrates (1) the longest midstance phase, (2) the greatest ankle angle range, and (3) greater forward movement of the center of pressure. There was some evidence that the DER feet produced a better push-off. However, neither the self-selected walking speed nor the metabolic rate or efficiency over a spectrum of walking speeds (73 to 120m/min) and running speeds (140 to 200m/min) was significantly different. Because no energy savings resulted for the DER feet, the release of stored energy in the flexible feet may not occur at the proper time to assist in ambulation as a result of the natural frequency of oscillation.
本研究比较了两种动态弹性响应（DER）假脚设计与SACH假脚的力学和生物力学功能、代谢需求及减震性能。对9名单侧膝下截肢患者进行了研究。假脚的力学性能与步态生物力学相关。Flex Foot的前足顺应性最大，SACH假脚的前足顺应性最小，因此，Flex Foot表现出：（1）支撑中期最长；（2）踝关节角度范围最大；（3）压力中心向前移动更大。有证据表明DER假脚产生了更好的蹬离效果。然而，在一系列步行速度（73至120米/分钟）和跑步速度（140至200米/分钟）下，自我选择的步行速度、代谢率或效率均无显著差异。由于DER假脚未节省能量，由于振荡的固有频率，柔性假脚中储存能量的释放可能未在适当时间发生以协助行走。
