Snyder R D, Powers C M, Fontaine C, Perry J
Rancho Los Amigos Medical Center, Pathokinesiology Laboratory, Downey, CA 90242, USA.
J Rehabil Res Dev. 1995 Nov;32(4):309-15.
The purpose of this study was to determine the effects of prosthetic foot design on the vertical ground reaction forces experienced by the sound and amputated limbs in a group of persons with dysvascular below-knee amputations. Stride characteristics, joint motion, and ground reaction forces were recorded simultaneously during a self-selected free walking velocity in seven subjects wearing five different prosthetic feet (SACH, Flex-Foot, Carbon Copy II, Seattle, Quantum). Subjects used each foot for one month prior to testing. Results indicated that the sound limb was exposed to higher vertical ground reaction forces than normal despite a reduced walking velocity. Use of the Flex-Foot resulted in the lowest sound limb vertical forces, which appears to be related to its large arc of dorsiflexion motion. In addition, there was increased loading response knee flexion of the sound limb indicating an attempt by these subjects to modulate floor impact. These results suggest that the intact lower extremity is susceptible to excessive floor impact, and that prosthetic foot design can have an effect on the magnitude of the vertical forces experienced by the limb.
本研究的目的是确定假肢足部设计对一组患有血管性膝下截肢的患者中健全肢体和截肢肢体所承受的垂直地面反作用力的影响。在七名佩戴五种不同假肢足部（SACH、Flex-Foot、Carbon Copy II、西雅图、量子）的受试者以自我选择的自由步行速度行走时，同时记录步幅特征、关节运动和地面反作用力。受试者在测试前使用每只足部一个月。结果表明，尽管步行速度降低，但健全肢体所承受的垂直地面反作用力仍高于正常水平。使用Flex-Foot导致健全肢体的垂直力最低，这似乎与其大的背屈运动弧度有关。此外，健全肢体的负重反应膝关节屈曲增加，表明这些受试者试图调节地面冲击。这些结果表明，完整的下肢易受过度地面冲击的影响，并且假肢足部设计可对肢体所承受的垂直力大小产生影响。
