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The influence of clearance on friction, lubrication and squeaking in large diameter metal-on-metal hip replacements

Brockett, CL, Harper, P, Williams, S, Isaac, GH, Dwyer-Joyce, RS, Jin, Z and Fisher, J (2008) The influence of clearance on friction, lubrication and squeaking in large diameter metal-on-metal hip replacements. Journal of Materials Science: Materials in Medicine, 19 (4). 1575 - 1579. ISSN 0957-4530

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Large diameter metal-on-metal bearings (MOM) are becoming increasingly popular, addressing the needs of young and more active patients. Clinical data has shown excellent short-to-mid-term results, though incidences of transient squeaking have been noted between implantation and up to 2 years post-operative. Geometric design features, such as clearance, have been significant in influencing the performance of the bearings. Sets of MOM bearings with different clearances were investigated in this study using a hip friction simulator to examine the influence of clearance on friction, lubrication and squeaking. The friction factor was found to be highest in the largest clearance bearings under all test conditions. The incidence of squeaking was also highest in the large clearance bearings, with all bearings in this group squeaking throughout the study. A very low incidence of squeaking was observed in the other two clearance groups. The measured lubricating film was found to be lowest in the large clearance bearings. This study suggests that increasing the bearing clearance results in reduced lubricant film thickness, increased friction and an increased incidence of squeaking.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright (c) 2008 Springer Science + Business Media. This is an author produced version of a paper published in ' Journal of Materials Science: Materials in Medicine '. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Torque; joint; surface replacement; resurfacing arthroplasty
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Medical and Biological Engineering (iMBE) (Leeds)
Depositing User: Mr Christopher Hardwick
Date Deposited: 18 Aug 2009 14:45
Last Modified: 23 Jun 2014 09:25
Published Version: http://dx.doi.org/10.1007/s10856-007-3298-9
Status: Published
Publisher: Springer Verlag
Refereed: Yes
Identification Number: 10.1007/s10856-007-3298-9
URI: http://eprints.whiterose.ac.uk/id/eprint/9166

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