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Effect of gap outside contact area on lubrication of metal-on-metal total hip replacement

Al-Saffar, Ali A. and Evans, Sam L. 2020. Effect of gap outside contact area on lubrication of metal-on-metal total hip replacement. Computer Methods in Biomechanics and Biomedical Engineering 23 (11) , pp. 675-689. 10.1080/10255842.2020.1758679

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Ball-in-socket metal on metal (MOM) contacts were analysed using the Abaqus Finite Element package to simulate dry contact between the acetabular cup and the femoral head. Different cup thicknesses of 4, 6, 8, and 10 mm were considered using a polyurethane foam block support system. Elastohydrodynamic lubrication (EHL) analyses were developed for the contacts using three different approaches to specify the contact. These were (i) A simple model based on the radii of relative curvature, (ii) An equivalent contact model developed so that its dry contact area and maximum pressure replicated the values obtained from the FE analysis, and (iii) A modified version of (ii) that also ensured equivalence of the gap shape outside the contact area. Published in vivo information for the hip joint contact forces over the walking cycle was used to specify the operating conditions for the EHL analysis. The analysis method was found to be effective for all points of the walking cycle for cases where the cup thickness exceeded 5 mm and modelling approach (ii) was identified as satisfactory. For a cup thickness of 4 mm, membrane action began to emerge in the FE analyses so that such contacts behaved in a different way.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Taylor & Francis
ISSN: 1025-5842
Date of Acceptance: 17 April 2020
Last Modified: 03 Sep 2020 12:36

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