Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31109
Title: Comparison of computational analysis with clinical measurement of stresses on below-knee residual limb in a prosthetic socket
Authors: Zhang, M 
Roberts, C
Keywords: Finite element modelling
Pressure
Prosthetic socket
Shear stress
Issue Date: 2001
Publisher: Elsevier Sci Ltd
Source: Medical engineering and physics, 2001, v. 22, no. 9, p. 607-612 How to cite?
Journal: Medical Engineering and Physics 
Abstract: Interface pressures and shear stresses between a below-knee residual limb and prosthetic socket predicted using finite element analyses were compared with experimental measurements. A three-dimensional nonlinear finite element model, based on actual residual geometry and incorporating PTB socket rectification and interfacial friction/slip conditions, was developed to predict the stress distribution. A system for measuring pressures and bi-axial shear stresses was used to measure the stresses in the PTB socket of a trans-tibial amputee. The FE-predicted results indicated that the peak pressure of 226 kPa occurred at the patellar tendon area and the peak shear stress of 50 kPa at the anterolateral tibia area. Quantitatively, FE-predicted pressures were 11%, on average, lower than those measured by triaxial transducers placed at all the measurement sites. Because friction/slip conditions between the residual limb and socket liner were taken into consideration by using interface elements in the FE model, the directions and magnitudes of shear stresses match well between the FE prediction and clinical measurements. The results suggest that the nonlinear mechanical properties of soft tissues and dynamic effects during gait should be addressed in future work.
URI: http://hdl.handle.net/10397/31109
ISSN: 1350-4533
DOI: 10.1016/S1350-4533(00)00079-5
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