Functional gait asymmetry of unilateral transfemoral amputees
Functional gait asymmetry of unilateral transfemoral amputees
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DOI：
10.1016/j.humov.2011.09.004
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发表时间：
2012-08-01
影响因子：
2.1
通讯作者：
Seyfarth, Andre
中科院分区：
文献类型：
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作者：
Schaarschmidt, Margrit;Lipfert, Susanne W.;Seyfarth, Andre
假肢装置的目的是模仿生物系统的功能。大量研究表明单侧截肢者的步态存在明显的不对称性。到目前为止，假肢和完整腿的潜在相互作用尚未得到广泛讨论。为了更深入地了解不对称的功能，我们研究了佩戴计算机化 C-Leg 和非计算机化 3R80 的经股截肢者行走的时间和动力学参数。在仪器跑步机上以四种不同的步行速度（0.5、0.8、1.1、1.4 m/s）进行实验，测量垂直和水平地面反作用力。计算了单支撑、双支撑和接触时间、垂直和水平冲量及其不对称系数。两个假肢膝关节的步态模式相似，表现为（i）假肢站立时间减少，（ii）双支撑过程中以较低速度从完整腿到假肢的负载转移时间延长，（iii）假肢垂直和水平冲量减少，（iv）净值 在假肢接触过程中加速水平脉冲，(v) 缺失假肢触地时的冲击力。我们的结果表明，假肢的缺陷，如缺失主动膝关节伸展和踝关节推出，可以由完整的腿补偿。改变的假肢触地配置使其能够提供向前的推进力，同时负载大部分转移到完整的腿上。 (C) 2011 Elsevier B.V. 保留所有权利。
The aim of prosthetic devices is to mimic the function of biological systems. Numerous investigations have demonstrated significant asymmetries in unilateral amputee gait. The underlying interactions of prosthetic and intact leg are not widely discussed, so far. To get more insight into the functionality of asymmetries, we investigated temporal and kinetic parameters of walking transfemoral amputees wearing the computerized C-Leg and the non-computerized 3R80.Experiments were conducted on an instrumented treadmill at four different walking speeds (0.5, 0.8, 1.1, 1.4 m/s) measuring vertical and horizontal ground reaction forces. Single support, double support and contact times, vertical and horizontal impulses as well as their asymmetry factors were calculated.Gait patterns were similar for both prosthetic knee joints, manifesting in (i) reduced stance times of the prosthetic leg, (ii) prolonged load transfer during double support from intact to prosthetic leg at lower speeds, (iii) reduced vertical and horizontal impulses of the prosthetic leg, (iv) net accelerating horizontal impulses during contact of the prosthetic leg, (v) missing impacts at touch-down of the prosthetic leg.Our results suggest that deficits of the prosthetic leg like missing active knee extension and ankle push-off are compensated by the intact leg. The altered touch-down configuration for the prosthetic leg enables it to provide forward propulsion while load bearing is largely shifted to the intact leg. (C) 2011 Elsevier B.V. All rights reserved.