Effects of prosthetic alignment changes on interfacial pressure in anteroposterior translation under level and non-level walking conditions

Pao Yue-kong Library Electronic Theses Database

Effects of prosthetic alignment changes on interfacial pressure in anteroposterior translation under level and non-level walking conditions

 

Author: Li, Ming-wah
Title: Effects of prosthetic alignment changes on interfacial pressure in anteroposterior translation under level and non-level walking conditions
Degree: M.Sc.
Year: 2001
Subject: Hong Kong Polytechnic University -- Dissertations
Prosthesis
Artificial limbs
Department: Multi-disciplinary Studies
Jockey Club Rehabilitation Engineering Centre
Pages: ix, 131 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1627753
URI: http://theses.lib.polyu.edu.hk/handle/200/881
Abstract: Prosthesis alignment of a trans-tibial prosthesis is defined as the tree-dimensional position and orientation of the socket relative to the prosthetic foot. Clinically, the prosthesis alignment is finalized based on subjective feeling of the amputee and the observed gait pattern. This procedure is subjective and skin breakdown at the interface between residual limb and socket is not uncommon. It is hypothesized that the interfacial stress between the residual limb and the socket could be optimized if an 'optimal' alignment is prescribed. In this study, the effects of prosthesis alignment on the interfacial pressure were investigated using an interfacial pressure mapping system (Tekscan System, USA). Although prosthesis alignment can be varied with 6 degrees-of-freedom, only the effects of antero-posterior (AP) translation of the socket relative to the prosthetic foot were investigated. Prosthesis alignment ranges of 5 subjects with amputation were firstly determined for level and non-level walking condition. Subsequently, interfacial pressures of the subjects walking with various alignments within the alignment range were measured and compared. The results showed that pressures varied between each subject and measurement sites in two walking condition. Hence, optimal alignment acceptable in level walking may not be acceptable in non-level walking and optimal alignment may not be prescribed at a low interfacial pressure situation. It was also found that the non-level walking was the most sensitive to prosthesis alignment change. Numerous other parameters are recommended for further study, as optimal alignment is compromise of various parameters.

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