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Determination of clinical wear in retrieved total hip replacement joints using shadowgraph and co-ordinate measurement methods

By Paul J. Bills and J.L. Cunningham

Abstract

Over the last twenty years or so, a number of increasingly complex joint simulators\ud have been developed and manufactured to evaluate new designs of total joint replacement. This\ud has been in response both to the greater understanding of joint biomechanics and the increase in\ud regulatory and pre-clinical testing required by law to ensure patient safety and product reliability.\ud Upon simulation of this clinically relevant wear it is important that it can be accurately quantified\ud and assessed. Furthermore it is vital to be able to assess whether in vitro produced component\ud wear is representative of true clinical wear, in order to audit the capability of the laboratory\ud testing to replicate real-world patient relevant conditions. To achieve this methods have been\ud developed to accurately quantify in vivo total joint replacement wear from retrieved total hip\ud replacement components. This paper explores two methods for determination of such clinical\ud wear and discusses the relative advantages of using each. To do this a number of retrieved total\ud hip replacement acetabular components were assessed for both volumetric and linear wear using\ud previously developed shadowgraph and co-ordinate measurement techniques and the results\ud reported and compared

Topics: Q1
OAI identifier: oai:eprints.hud.ac.uk:3917
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