Journal
JOURNAL OF BIOMECHANICS
Volume 41, Issue 11, Pages 2474-2482Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2008.05.015
Keywords
gait kinematics; flip replacement; multidirectional motion; wear
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Funding
- Northern Ireland Research and Development Office Small Grant Scheme
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Wear particle accumulation is one of the main contributors to osteolysis and implant failure in hip replacements. Altered kinematics produce significant differences in wear rates of hip replacements in simulator Studies due to varying degrees of multidirectional motion. Gait analysis data from 153 hip-replacement patients 10-years post-operation were used to model two- and three-dimensional wear paths for each patient. Wear paths were quantified in two dimensions using aspect ratios and in three dimensions using the surface areas of the wear paths, with wear-path surface area correlating poorly with aspect ratio. The average aspect ratio of the patients wear paths was 3.97 (standard deviation = 1.38), ranging from 2.13 to 10.86. Sixty percent of patients displayed aspect ratios between 2.50 and 3.99. However, 13% of patients displayed wear paths with aspect ratios > 5.5, which indicates reduced multidirectional motion. The majority of total hip replacement (THR) patients display gait kinematics which produce multidirectional wear paths, but a significant minority display more linear paths. (c) 2008 Elsevier Ltd. All rights reserved.
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