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Comparative retrieval analysis of contemporary mobile and fixed unicompartmental knee bearing designs

Lookup NU author(s): Shannen Chacko Rajan, Dr Oana Bretcanu, Professor David Deehan, Professor Tom Joyce



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


© 2022. There are two different concepts behind Unicompartmental Knee Replacement (UKR). Mobile bearings, as exemplified by the Oxford UKR, and fixed bearings, as exemplified by the Physica ZUK. These are the two most commonly implanted UKRs in the UK. For the first time, a comparison of the tribological features of 19 explanted Oxford and 19 explanted Physica ZUK UKRs was undertaken. Surface damage on the polyethylene (PE) inserts of the Oxford and Physica ZUK cohorts were assessed using an established semi-quantitative scoring method. The femoral components of both cohorts were assessed using a non-contact 3D profilometer to measure roughness values. It was found that the PE inserts of the Oxford cohort (22.54 ± 9.14) had statistically significant greater damage scores than the Physica ZUK cohort (16.50 ± 5.17) (p = 0.04). However, the femoral components of the Oxford cohort showed lower roughness values than the Physica ZUK cohort (p = 0.00). This is the first study that reports a comparative roughness analysis between retrieved Oxford and Physica ZUK UKR designs.

Publication metadata

Author(s): Chacko Rajan S, Bretcanu O, Deehan DJ, Joyce TJ

Publication type: Article

Publication status: Published

Journal: Journal of the Mechanical Behavior of Biomedical Materials

Year: 2022

Volume: 127

Print publication date: 01/03/2022

Online publication date: 08/01/2022

Acceptance date: 03/01/2022

Date deposited: 23/03/2022

ISSN (print): 1751-6161

ISSN (electronic): 1878-0180

Publisher: Elsevier Ltd


DOI: 10.1016/j.jmbbm.2022.105076

ePrints DOI: 10.57711/6rhp-a849


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