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Finite Element Modeling to Aid in Refining the Rehabilitation of Amputees Using Osseointegrated Prostheses

By Winson C.C. Lee, Laurent A. Frossard, Nicola J. Cairns, Rickard Branemark, John H. Evans, Clayton J. Adam and Mark J. Pearcy

Abstract

The direct anchorage of a lower-limb prosthesis to the bone has been shown to be an excellent alternative for amputees experiencing complications in using a conventional prosthetic socket. After surgical implantation, amputees have to go through a weight bearing exercise program to prepare the bone to tolerate forces and promote bone-remodeling. Currently, the load magnitude prescribed by the clinician is measured by a weight scale which reports only the axial force in the limb. Previous study using a load transducer revealed that in addition to the axial force there were other forces and moments. This study develops a FE model and utilizes our load data to investigate the stress distribution at the bone-implant interface. The model shows that the stress distribution could be highly non-uniform during the exercise. Bone-implant interface stress has certain implications in pain adaptation and bone-remodeling, and a good understanding of it can assist in future attempts to refine and shorten the period of rehabilitation exercise

Topics: 090302 Biomechanical Engineering, transfemoral amputation, bone anchorage prosthetics, osseointegration, weight bearing exercise, finite element modeling
Publisher: Springer
Year: 2007
DOI identifier: 10.1007/978-3-540-73321-8_75
OAI identifier: oai:eprints.qut.edu.au:15236

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