A new pin-on-disk wear testing method for simulating wear of polyethylene on cobalt-chrome alloy in total hip arthroplasty

Hip simulator studies show that the wear of ultra-high molecular weight polyethylene against a cobalt alloy head depends on the wear path, especially the combination of a predominantly linear wear direction on which is superimposed motions in different directions. We postulated that multidirectional...

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Bibliographic Details
Published in:The Journal of arthroplasty 2001-08, Vol.16 (5), p.658-665
Main Authors: Bragdon, Charles R., O'Connor, Daniel O., Lowenstein, Jay D., Jasty, Murali, Biggs, Stephen A., Harris, William H.
Format: Article
Language:English
Subjects:
Chromium Alloys
Cobalt
Equipment Design
Hip Prosthesis
Humans
Materials Testing - instrumentation
Microscopy, Electron, Scanning
Particle Size
pin-on-disk testing
polyethylene wear
Polyethylenes
Prosthesis Failure
Stress, Mechanical
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Summary:Hip simulator studies show that the wear of ultra-high molecular weight polyethylene against a cobalt alloy head depends on the wear path, especially the combination of a predominantly linear wear direction on which is superimposed motions in different directions. We postulated that multidirectional motion was necessary to generate realistic wear rates in pin-on-disk testing. To assess this hypothesis, a new pin-on-disk tester was developed, capable of unidirectional and bidirectional motion. Unidirectional motion produced no detectable wear. The rectangular motion produced wear rates, surface morphologies, and wear particles consistent with human acetabular specimens. The results for 1 Hz and 2 Hz were similar.
ISSN:0883-5403
1532-8406
DOI:10.1054/arth.2001.23718