Contributions of muscle forces and toe-off kinematics to peak knee flexion during the swing phase of normal gait: an induced position analysis
Contributions of muscle forces and toe-off kinematics to peak knee flexion during the swing phase of normal gait: an induced position analysis
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DOI：
10.1016/j.jbiomech.2003.09.018
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发表时间：
2004-05-01
影响因子：
2.4
通讯作者：
Delp, SL
中科院分区：
文献类型：
--
作者：
Anderson, FC;Goldberg, SR;Delp, SL
步行的三维动态模拟与诱导位置分析一起使用，以确定脚趾离地时的运动条件和脚趾离地后的肌肉力量如何影响正常步态摆动阶段的峰值膝关节弯曲。足尖离地时摆动肢膝关节的屈曲速度对膝关节最大屈曲角度贡献了30度；这比单个肌肉或关节力矩的任何贡献都大。摆动肢肌肉单独对膝关节角度贡献较大（即大至 22 度），但它们的动作往往相互平衡，因此所有摆动肢肌肉的综合贡献很小（即屈曲小于 3 度）。摆动肢的单关节肌肉对膝关节屈曲的贡献比摆动肢的双关节肌肉大一个数量级。诱导位置分析的结果清楚地表明了足尖离地时膝关节屈曲速度相对于足尖离地后施加的肌肉力在产生峰值膝关节屈曲角度方面的影响的重要性。除了提高我们对正常步态的理解之外，这项研究还为分析僵膝步态提供了基础，僵膝步态是一种运动异常，在这种运动异常中，摆动时膝关节的屈曲度减少。 (C) 2003 Elsevier Ltd. 保留所有权利。
A three-dimensional dynamic simulation of walking was used together with induced position analysis to determine how kinematic conditions at toe-off and muscle forces following toe-off affect peak knee flexion during the swing phase of normal gait. The flexion velocity of the swing-limb knee at toe-off contributed 30degrees to the peak knee flexion angle; this was larger than any contribution from an individual muscle or joint moment. Swing-limb muscles individually made large contributions to knee angle (i.e., as large as 22degrees), but their actions tended to balance one another, so that the combined contribution from all swing-limb muscles was small (i.e., less than 3degrees of flexion). The uniarticular muscles of the swing limb made contributions to knee flexion that were an order of magnitude larger than the biarticular muscles of the swing limb. The results of the induced position analysis make clear the importance of knee flexion velocity at toe-off relative to the effects of muscle forces exerted after toe-off in generating peak knee flexion angle. In addition to improving our understanding of normal gait, this study provides a basis for analyzing stiff-knee gait, a movement abnormality in which knee flexion in swing is diminished. (C) 2003 Elsevier Ltd. All rights reserved.