The influence of wear paths produced by hip replacement patients during normal walking on wear rates

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
Damien BennettD E Beverland

Abstract

Variation in wear paths is known to greatly affect wear rates in vitro, with multidirectional paths producing much greater wear than unidirectional paths. This study investigated the relationship between multidirectional motion at the hip joint, as measured by aspect ratio, sliding distance, and wear rate for 164 hip replacements. Kinematic input from three-dimensional gait analysis was used to determine the wear paths. Activity cycles were determined for a subgroup of 100 patients using a pedometer study, and the relationship between annual sliding distance and wear rate was analyzed. Poor correlations were found between both aspect ratio and sliding distance and wear rate for the larger group and between annual sliding distance and wear rate for the subgroup. However, patients who experienced a wear rate <0.08 mm/year showed a strong positive correlation between the combination of sliding distance, activity levels, and aspect ratio and wear rate (adjusted r(2) = 55.4%). This group may represent those patients who experience conditions that most closely match those that prevail in simulator and laboratory tests. Although the shape of wear paths, their sliding distance, and the number of articulation cycles at the hip joint aff...Continue Reading

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Citations

Oct 26, 2012·Journal of Orthopaedic Science : Official Journal of the Japanese Orthopaedic Association·Kimie FujitaTakao Hotokebuchi
Jun 28, 2011·Medical Engineering & Physics·S J MellonH S Gill
Oct 29, 2009·Clinical Orthopaedics and Related Research·Florian D Naal, Franco M Impellizzeri
May 3, 2013·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Sarah BudenbergTodd D Stewart
May 3, 2013·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Stephen J MellonHarinderjit S Gill
Sep 25, 2015·Annals of Biomedical Engineering·Vicky VuongHåkan Engqvist

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