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Load transfer mechanics between trans-tibial prosthetic socket and residual limb—dynamic effects

Jia, Xiaohong, Zhang, Ming, & Lee, Winson C.C. (2004) Load transfer mechanics between trans-tibial prosthetic socket and residual limb—dynamic effects. Journal of Biomechanics, 37(9), pp. 1371-1377.

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Abstract

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.

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49 citations in Scopus
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27 citations in Web of Science®

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ID Code: 2959
Item Type: Journal Article
Keywords: Prosthetic socket, Finite element analysis, Interface pressure, Shear stress, Inertia
DOI: 10.1016/j.jbiomech.2003.12.024
ISSN: 0021-9290
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Rehabilitation Engineering (090305)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 19 Dec 2005
Last Modified: 11 Aug 2011 04:37

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