Zernicke R F, Hoy M G, Whiting W C
Arch Phys Med Rehabil. 1985 Nov;66(11):736-41.
Ground reaction forces and center of pressure (CP) were studied during gait in children with unilateral lower extremity amputations. Five children, three with knee disarticulations and two with above-knee amputations, walked at slow, normal, and fast speeds, while wearing a conventional SACH prosthetic foot and again, while wearing an experimental CAPP prosthetic foot. Fore-aft (F-A) and vertical force (VF) components and CP patterns were examined for a total of 90 trials. Walking speed had a significant effect on both F-A and VF amplitudes. No differences, however, were found between the force amplitudes of the SACH foot and CAPP foot. Significant asymmetries were found in the force and amplitudes of a child's natural limb versus the prosthetic limb; the retarding and propelling F-A forces in the prosthetic limb were significantly less than the corresponding forces in a child's natural limb. The CP patterns during stance phase were markedly different for a child's natural limb, prosthetic limb with the SACH foot, and prosthetic limb with the CAPP foot. With the CAPP foot, the CP remained in the forefoot region during stance. In contrast with the CAPP foot, the SACH foot had a potential for producing a flexor moment at the knee joint at the initiation of the foot-ground contact. Stability in the prosthetic knee was enhanced when the children wore a CAPP prosthetic foot.
研究了单侧下肢截肢儿童在步态过程中的地面反作用力和压力中心（CP）。五名儿童，三名膝关节离断者和两名大腿截肢者，分别以慢、正常和快的速度行走，分别穿着传统的SACH假足，以及再次穿着实验性的CAPP假足。总共进行了90次试验，检查了前后（F-A）和垂直力（VF）分量以及CP模式。步行速度对F-A和VF幅度均有显著影响。然而，未发现SACH足和CAPP足的力幅度之间存在差异。在儿童的自然肢体与假肢肢体的力和幅度方面发现了显著的不对称性；假肢肢体中的减速和推进F-A力明显小于儿童自然肢体中的相应力。儿童自然肢体、佩戴SACH足的假肢肢体和佩戴CAPP足的假肢肢体在站立期的CP模式明显不同。使用CAPP足时，CP在站立期间保持在前足区域。与CAPP足相比，SACH足在脚与地面接触开始时有可能在膝关节产生屈肌力矩。当儿童佩戴CAPP假足时，假肢膝关节的稳定性得到增强。
