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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 HartIn 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 MedicineISSN
0954-4119Publisher
SAGE PublicationsExternal DOI
Issue
5Volume
222Page range
657-667Department affiliated with
- Engineering and Design Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2013-10-03Usage metrics
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