Transient mixed lubrication model of the human knee implant

Butt, H., Nissim, L., Gao, L. ORCID: 0000-0002-3738-3573, Myant, C., De Boer, G. and Hewson, R., 2021. Transient mixed lubrication model of the human knee implant. Biosurface and Biotribology, 7 (4), pp. 206-218. ISSN 2405-4518

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Abstract

The human knee implant is computationally modelled in the mixed lubrication regime to investigate the tribological performance of the implant. This model includes the complex geometry of the implant components, unlike elliptical contact models that approximate this geometry. Film thickness and pressure results are presented for an ISO gait cycle to determine the lubrication regime present within the implant during its operation. It was found that it was possible for the lubrication regime to span between elastohydrodynamic, mixed and boundary lubrication depending on the operating conditions of the implant. It was observed that the tribological conditions present in one condyle were not necessarily representative of the other. Multiple points of contact were found within the same condyle, which cannot be computed by the elliptical contact solvers. This model can be used to balance forces in all directions, instead of only the normal loads, as often done in elliptical contact models. This work is an initial step towards understanding the role of the complex geometry in the tribological characteristics of the human knee implant when operating in physiological conditions.

Item Type: Journal article
Publication Title: Biosurface and Biotribology
Creators: Butt, H., Nissim, L., Gao, L., Myant, C., De Boer, G. and Hewson, R.
Publisher: Institution of Engineering and Technology
Date: 12 November 2021
Volume: 7
Number: 4
ISSN: 2405-4518
Identifiers:
NumberType
10.1049/bsb2.12020DOI
1456212Other
Rights: © 2021 The Authors. Biosurface and Biotribology published by John Wiley & Sons Ltd on behalf of Institution of Engineering and Technology (IET) and Southwest Jiaotong University. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Divisions: Schools > School of Science and Technology
Record created by: Laura Ward
Date Added: 08 Feb 2022 11:21
Last Modified: 08 Feb 2022 11:21
URI: http://irep.ntu.ac.uk/id/eprint/45553

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