Load transfer mechanics between trans-tibial prosthetic socket and residual limb - dynamic effects
Load transfer mechanics between trans-tibial prosthetic socket and residual limb - dynamic effects
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DOI：
10.1016/j.jbiomech.2003.12.024
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发表时间：
2004-09-01
影响因子：
2.4
通讯作者：
Lee, WCC
中科院分区：
文献类型：
--
作者：
Jia, XH;Zhang, M;Lee, WCC
研究了惯性载荷对经胫骨残肢与接受腔界面应力的影响。使用Vicon运动分析系统监测肢体和假肢的运动，并通过测力平台测量地面反作用力。在步行过程中的膝关节等效载荷计算在两种情况下，考虑和不考虑材料的惯性。建立了一个基于残肢、内骨骼和臼衬实际几何形状的三维非线性有限元模型，研究了行走过程中臼与残肢之间的力学相互作用。为了模拟皮肤和内衬之间的摩擦/滑动边界条件，使用了自动表面-表面接触。预测结果表明，在静止阶段，界面压力和剪切应力具有相似的双峰波形。考虑和不考虑惯性力的两种情况下的界面应力的平均差异在站立相为8.4%，在摆动相为20.1%。在站立阶段的最大差异高达19%。这表明，最好在全动态有限元模型中考虑材料惯性效应。(C)2004 Elsevier Ltd.保留所有权利。
The effects of inertial loads on the interface stresses between trans-tibial residual limb and prosthetic socket were investigated. The motion of the limb and prosthesis was monitored using a Vicon motion analysis system and the ground reaction force was measured by a force platform. Equivalent loads at the knee joint during walking were calculated in two cases with and without consideration of the material inertia. A 3D nonlinear finite element (FE) model based on the actual geometry of residual limb, internal bones and socket liner was developed to study the mechanical interaction between socket and residual limb during walking. To simulate the friction/slip boundary conditions between the skin and liner, automated surface-to-surface contact was used. The prediction results indicated that interface pressure and shear stress had the similar double-peaked waveform shape in stance phase. The average difference in interface stresses between the two cases with and without consideration of inertial forces was 8.4% in stance phase and 20.1% in swing phase. The maximum difference during stance phase is up to 19%. This suggests that it is preferable to consider the material inertia effect in a fully dynamic FE model. (C) 2004 Elsevier Ltd. All rights reserved.