Thesis

Pressure distribution at the stump socket interface in trans-tibial amputees

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Awarding institution
  • University of Strathclyde
Date of award
  • 2001
Thesis identifier
  • T10334
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • The patellar tendon bearing prosthesis is one of the most popular prosthesis for trans- tibial amputees. However, an ideal patellar tendon bearing socket is one which has an even pressure distribution and at the same time the sensitive areas of the stump are adequately guarded. Although many studies have been carried out to investigate the pressure distribution at the stump socket interface, the fabrication of the socket still relies mostly on the skill of the prosthetist. In a patellar tendon bearing prosthesis, load is mainly taken by the patellar tendon bar. This study was aimed at investigating the stump/socket interface pressures at various horizontal displacements of the patellar tendon bar. This was thought to simulate the pressure the prosthetist applies while taking the cast. A special transducer was developed in this university in a previous study (Osman, 1999), which was capable of displacing the patellar tendon bar forwards and at the same time measuring the forces along three orthogonal directions. However the design of this transducer restricted its use to only one subject. The present study aimed to investigate more than one subject, and so a Patellar tendon bar (Mark-II) transducer was developed, which was capable of being used in more than one subject. This study also aimed at identifying areas of high pressure around the socket and studying the pressure variations in them in different displacements of the patellar tendon bar. Six Entran transducers were used for this purpose and initially areas of high pressure were determined using force sensing resistors (Rincoe socket fitting system). The results obtained in this study which was done on two subjects showed that pressures around the socket did not vary significantly with horizontal displacements of the patellar tendon bar. Subjects who had a shorter stump recorded high pressures and his peak pressures during dynamic gait reached up to 800 kPa. It was discussed later that these high pressures were due to the short stump, and the hard socket that was used to carry out this study. The transducer that was developed showed good linearity and repeatability and had minimal cross talk effects.
Advisor / supervisor
  • Spence, William D.
  • Solomonidis, S. E.
Resource Type
DOI

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