Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/31583
Title: A quasi-dynamic nonlinear finite element model to investigate prosthetic interface stresses during walking for trans-tibial amputees
Authors: Jia, X
Zhang, M 
Li, X
Lee, WCC
Keywords: Finite element analysis
Inertial loads
Interface pressure
Knee flexion
Prosthetic socket
Issue Date: 2005
Publisher: Pergamon Press
Source: Clinical biomechanics, 2005, v. 20, no. 6, p. 630-635 How to cite?
Journal: Clinical biomechanics 
Abstract: Background. To predict the interface pressure between residual limb and prosthetic socket for trans-tibial amputees during walking. Methods. A quasi-dynamic finite element model was built based on the actual geometry of residual limb, internal bones and socket liner. To simulate the friction/slip boundary conditions between the skin and liner, automated surface-to-surface contact was used. Besides variable external loads and material inertia, the coupling between the large rigid displacement of knee joint and small elastic deformation of residual limb and prosthetic components were also considered. Results. Interface pressure distribution was found to have the same profile during walking. The high pressures fall over popliteal depression, middle patella tendon, lateral tibia and medial tibia regions. Interface pressure predicted by static or quasi-dynamic analysis had the similar double-peaked waveform shape in stance phase. Interpretation. The consideration of inertial effects and motion of knee joint cause 210% average variation of the area between the pressure curve and the horizontal line of pressure threshold between two cases, even though there is only a small change in the peak pressure. The findings in this paper show that the coupling dynamic effects of inertial loads and knee flexion must be considered to study interface pressure between residual limb and prosthetic socket during walking.
URI: http://hdl.handle.net/10397/31583
ISSN: 0268-0033
EISSN: 1879-1271
DOI: 10.1016/j.clinbiomech.2005.03.001
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