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Clinical Orthopaedics and Related Research®

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01-09-2009 | Symposium: Papers Presented at the Annual Closed Meeting of the International Hip Society

High Cup Angle and Microseparation Increase the Wear of Hip Surface Replacements

Authors: Ian J. Leslie, PhD, Sophie Williams, PhD, Graham Isaac, PhD, Eileen Ingham, PhD, John Fisher, PhD

Published in: Clinical Orthopaedics and Related Research® | Issue 9/2009

Abstract

High wear rates and high patient ion levels have been associated with high (> 55°) cup inclination angles for metal-on-metal surface replacements. Wear rates and patterns have been simulated for ceramic-on-ceramic bearings by applying microseparation to replicate head offset deficiency. We tested 39-mm metal-on-metal surface replacements (n = 5) in a hip simulator with (A) an increased cup inclination angle of 60° and (B) an increased cup inclination angle and microseparation over 2 million cycles. (A) resulted in a ninefold increase in wear rate and (B) resulted in a 17-fold increase in wear rate compared to a standard gait condition study. Wear particles produced under microseparation conditions were larger than those produced under standard conditions but of similar shape (round to oval). The data suggest both head and cup position influence the wear of surface replacements; we believe it likely bearings with high wear either have a high cup inclination angle, an offset deficient head, or a combination of both.

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Title: High Cup Angle and Microseparation Increase the Wear of Hip Surface Replacements
Authors: Ian J. Leslie, PhD
Sophie Williams, PhD
Graham Isaac, PhD
Eileen Ingham, PhD
John Fisher, PhD
Publication date: 01-09-2009
Publisher: Springer-Verlag
Published in: Clinical Orthopaedics and Related Research® / Issue 9/2009
Print ISSN: 0009-921X
Electronic ISSN: 1528-1132
DOI: https://doi.org/10.1007/s11999-009-0830-x

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