The effect of insert conformity and material on total knee replacement wear

Abdelgaied, A ORCID: https://orcid.org/0000-0003-0066-1688, Brockett, CL, Liu, F, Jennings, LM, Jin, Z and Fisher, J, 2014. The effect of insert conformity and material on total knee replacement wear. Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine, 228 (1), pp. 98-106. ISSN 0954-4119

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Abstract

The mean average life is increasing; therefore, there is a need to increase the lifetime of the prostheses. To fulfil this requirement, new prosthetic designs and materials are being introduced. Two of the design parameters that may affect wear of total knee replacements, and hence the expected lifetime, are the insert conformity and material. Computational models have been used extensively for wear prediction and optimisation of artificial knee designs. The objective of the present study was to use a previously validated non-dimensional wear coefficient-based computational wear model to investigate the effect of insert conformity and material on the predicted wear in total knee replacements. Four different inserts (curved, lipped, partial flat and custom flat), with different conformity levels, were tested against the same femoral and under two different kinematic inputs (intermediate and high), with different levels of cross-shear. The insert bearing materials were either conventional or moderately cross-linked ultra-high molecular weight polyethylene (UHMWPE). Wear predictions were validated against the experimental data from Leeds knee simulation tests. The predicted wear rates for the curved insert (most conformed) were more than three times those for the flat insert (least conformed). In addition, the computationally predicted average volumetric wear rates for moderately cross-linked UHMWPE bearings were less than half of their corresponding conventional UHMWPE bearings. Moreover, the wear of the moderately cross-linked UHMWPE was shown to be less dependent on the degree of cross-shear, compared to conventional UHMWPE. These results along with supporting experimental studies provide insight into the design variables, which may reduce wear in knee replacements.

Item Type:	Journal article
Publication Title:	Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine
Creators:	Abdelgaied, A., Brockett, C.L., Liu, F., Jennings, L.M., Jin, Z. and Fisher, J.
Publisher:	SAGE Publications
Date:	1 January 2014
Volume:	228
Number:	1
ISSN:	0954-4119
Identifiers:	Number Type 10.1177/0954411913513251 DOI 1237678 Other
Rights:	© IMechE 2013. This article is distributed under the terms of the Creative Commons Attribution 3.0 License (http://www.creativecommons.org/licenses/by/3.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).
Divisions:	Schools > School of Science and Technology
Record created by:	Laura Ward
Date Added:	16 Jul 2021 11:00
Last Modified:	16 Jul 2021 11:00
URI:	https://irep.ntu.ac.uk/id/eprint/43510

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