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The effect of polyethylene thickness in fixed- and mobile-bearing total knee replacements

journal contribution
posted on 2023-06-08, 15:58 authored by J F Shi, Chang WangChang Wang, F Berryman, W Hart
In this paper fixed- and mobile-bearing implants were simulated using a multibody dynamic model and a finite element model to investigate the contact pressure distribution in the ultra high molecular weight polyethylene tibial bearing component. The thickness of polyethylene varied from 6.8 to 12.3 mm and the polyethylene was modelled as a non-linear material. It was found that the contact pressure on the polyethylene decreased in the fixed-bearing implant when the thickness of polyethylene increased from 6.8 to 8 and 9.6 mm, but there was little further decrease in pressure with the increase of polyethylene thickness from 9.6 to 11.0 and 12.3 mm. In the mobile-bearing implant, no increase in contact pressure on the superior surface was found with the increase in the thickness of the polyethylene; however, the contact pressures on the inferior contact surface of the thicker designs were higher than those in the 6.8 mm design. The numerical results obtained in this paper are in good agreement with published experimental test results. Moreover, the paper presents a detailed pressure distribution on the tibial bearing component during a full gait cycle.

History

Publication status

  • Published

Journal

Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine

ISSN

0954-4119

Publisher

SAGE Publications

Issue

5

Volume

222

Page range

657-667

Department affiliated with

  • Engineering and Design Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2013-10-03

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