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Orthopaedic Proceedings
Vol. 97-B, Issue SUPP_12 | Pages 5 - 5
1 Nov 2015
Langton D Killen M Sidaginamale R Bowsher J Savisaar C Nargol A Joyce T Lord J
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Introduction

In this study, we aimed to investigate the effect of the topography of the female taper surface on taper wear.

Patients/Materials & Methods

We measured volumetric material loss at the female taper surface of the first consecutive 36mm MoM hips received at our centre. The MoM hips were from a single manufacturer and possessed matching: head size (36mm); taper geometry (5.65 degree 12 14 tapers); and metallurgy (cobalt chrome female taper mated with a titanium stem). Volume loss was measured with a coordinate measuring machine using validated methods. Surface roughness was measured using a Surftest SJ400. There were 111 head tapers available for analysis. The majority had been revised secondary to ARMD, and a minority for loosening. The mean duration of implantation was 56 months. Volumetric wear values were log normalised in order to construct a multiple regression model to investigate the interaction of head offset, the head taper angle and the Rp value of the female taper surface. Rp is a roughness parameter, which is a measure of the peaks above the plateau of a surface.