Influence of contact pressure, cross-shear and counterface material on the wear of PEEK and CFR-PEEK for orthopaedic applications

Brockett, C.L., Carbone, S., Abdelgaied, A. ORCID: 0000-0003-0066-1688, Fisher, J. and Jennings, L.M., 2016. Influence of contact pressure, cross-shear and counterface material on the wear of PEEK and CFR-PEEK for orthopaedic applications. Journal of the Mechanical Behavior of Biomedical Materials, 63, pp. 10-16. ISSN 1751-6161

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Total joint replacement is a successful surgical intervention for the treatment of the degeneration of many joints, particularly the hip and knee. As the demand for joint replacement grows, and the life expectancy of the population increases, the performance requirements of these implants also changes. New materials, to improve longevity and enhance performance have been explored including PEEK and CFR-PEEK.

This study investigated whether CFR-PEEK and PEEK were appropriate materials for total joint replacement by examining wear performance in simple configuration studies articulating against cobalt chrome under a range of cross-shear and contact pressure conditions. Simple geometry pin on plate studies were conducted for one million cycles for each test condition, with the contact pressure and cross-shear conditions representing a range in which the material may need to operate in-vivo.

The wear factor for PEEK was significantly higher than CFR-PEEK and conventional polyethylene under all test conditions. Both PEEK and CFR-PEEK wear were influenced by contact pressure, with the highest wear factors for both materials measured at the highest pressure conditions. PEEK appeared to have a cross-shear dependent wear response, but this was not observed for the CFR-PEEK material.

This study has further characterised the wear performance of two materials that are gaining interest for total joint replacement. The wear performance of the PEEK material showed poorer wear performance compared to polyethylene when articulating with a metal counterface, but the performance of the CFR-PEEK material suggested it may provide a suitable alternative to polyethylene in some applications. The wear performance of CFRPEEK was poorer than polyethylene when it was used as the plate, when there was translation of the contact zone over the surface of the CFR-PEEK plate. This has implications for applications in low conforming contacts, such as lower conformity knee replacement.

Item Type: Journal article
Publication Title: Journal of the Mechanical Behavior of Biomedical Materials
Creators: Brockett, C.L., Carbone, S., Abdelgaied, A., Fisher, J. and Jennings, L.M.
Publisher: Elsevier Ltd.
Date: October 2016
Volume: 63
ISSN: 1751-6161
S1751616116301710Publisher Item Identifier
Rights: 1751-6161/& 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (
Divisions: Schools > School of Science and Technology
Record created by: Jill Tomkinson
Date Added: 19 Aug 2019 10:51
Last Modified: 19 Aug 2019 10:51

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