The influence of clearance on friction, lubrication and squeaking in large diameter metal-on-metal hip replacements |
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| Authors: | Claire L Brockett Phil Harper Sophie Williams Graham H Isaac Rob S Dwyer-Joyce Zhongmin Jin John Fisher |
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| Affiliation: | (1) Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, LS2 9JT, UK;(2) Tribosonics Ltd, Sheffield, UK;(3) DePuy International and Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, Leeds, UK;(4) Tribology Group, Department of Mechanical Engineering, University of Sheffield, Sheffield, UK |
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| Abstract: | 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. |
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