Contact mechanics of modular metal-on-polyethylene total hip replacement under adverse edge loading conditions

Article


Hua, X., Li, J., Wang, L., Jin, Z., Wilcox, R. and Fisher, J. 2014. Contact mechanics of modular metal-on-polyethylene total hip replacement under adverse edge loading conditions. Journal of Biomechanics. 47 (13), pp. 3303-3309. https://doi.org/10.1016/j.jbiomech.2014.08.015
TypeArticle
TitleContact mechanics of modular metal-on-polyethylene total hip replacement under adverse edge loading conditions
AuthorsHua, X., Li, J., Wang, L., Jin, Z., Wilcox, R. and Fisher, J.
Abstract

Edge loading can negatively impact the biomechanics and long-term performance of hip replacements. Although edge loading has been widely investigated for hard-on-hard articulations, limited work has been conducted for hard-on-soft combinations. The aim of the present study was to investigate edge loading and its effect on the contact mechanics of a modular metal-on-polyethylene (MoP) total hip replacement (THR). A three-dimensional finite element model was developed based on a modular MoP bearing. Different cup inclination angles and head lateral microseparation were modelled and their effect on the contact mechanics of the modular MoP hip replacement were examined. The results showed that lateral microseparation caused loading of the head on the rim of the cup, which produced substantial increases in the maximum von Mises stress in the polyethylene liner and the maximum contact pressure on both the articulating surface and backside surface of the liner. Plastic deformation of the liner was observed under both standard conditions and microseparation conditions, however, the maximum equivalent plastic strain in the liner under microseparation conditions of 2000 µm was predicted to be approximately six times that under standard conditions. The study has indicated that correct positioning the components to avoid edge loading is likely to be important clinically even for hard-on-soft bearings for THR.

Research GroupBiophysics and Bioengineering group
PublisherElsevier
JournalJournal of Biomechanics
ISSN0021-9290
Electronic1873-2380
Publication dates
Online01 Sep 2014
Print01 Oct 2014
Publication process dates
Deposited05 Jun 2017
Accepted18 Aug 2014
Output statusPublished
Publisher's version
License
Digital Object Identifier (DOI)https://doi.org/10.1016/j.jbiomech.2014.08.015
LanguageEnglish
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