The effect of kinematic conditions on the wear of ultra-high molecular weight polyethylene (UHMWPE) in orthopaedic bearing applications

It is known that wear mechanisms differ between the ultra-high molecular weight polyethylene (UHMWPE) components of total hip replacement (THR) and total knee replacement (TKR). The difference in relative contact position or 'kinematic conditions of contact' between the metal and polymer c...

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Bibliographic Details
Published inProceedings of the Institution of Mechanical Engineers. Part H, Journal of engineering in medicine Vol. 215; no. 1; p. 95
Main Authors Cornwall, G B, Bryant, J T, Hansson, C M
Format Journal Article
LanguageEnglish
Published England 2001
Subjects
Arthroplasty, Replacement, Hip - instrumentation
Arthroplasty, Replacement, Knee - instrumentation
Biomechanical Phenomena
Hip Prosthesis
Humans
Knee Prosthesis
Materials Testing
Molecular Weight
Polyethylene - chemistry
Prosthesis Design - instrumentation
Surface Properties
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Summary:It is known that wear mechanisms differ between the ultra-high molecular weight polyethylene (UHMWPE) components of total hip replacement (THR) and total knee replacement (TKR). The difference in relative contact position or 'kinematic conditions of contact' between the metal and polymer components is thought to contribute to the contrast in observed wear mechanisms. A reciprocating wear tester was used to evaluate three basic kinematic contact conditions: sliding, in which the relative contact position on the polymer remains stationary; gliding, where the contact position on the polymer reciprocates; and rolling, where the contact position on the polymer varies and the relative velocities of both components are equal. All static load tests used cast Co-Cr alloy and irradiated Chirulen UHMWPE in a 37 degrees C environment lubricated with bovine serum albumin. UHMWPE test sample wear was measured gravimetrically at intervals of 600,000 cycles. The results indicated a difference in wear factor (volume lost due to wear per unit load per unit sliding distance) between the three groups with varying relative motion. The study indicates that screening tests which evaluate wear properties of new materials for total joint replacement should reflect the different kinematic contact conditions.
ISSN:0954-4119
DOI:10.1243/0954411011533454