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Assessing the material loss of the modular taper interface in retrieved metal on metal hip replacements

Bills, Paul J., Racasan, Radu, Tessier, P and Blunt, Liam (2015) Assessing the material loss of the modular taper interface in retrieved metal on metal hip replacements. Surface Topography: Metrology and Properties, 3 (2). 025002. ISSN 2051-672X

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Abstract

Measuring the amount of material loss in the case of revised hip replacements is considered to be a prerequisite of understanding and assessing the true in vivo performance of the implant. This paper outlines a method developed by the authors for quantifying taper material loss as well as more general taper interface parameters. Previous studies have mostly relied on visual inspection to assess the material loss at the taper interface, whereas this method aims to characterize any surface and form changes through the use of an out-of-roundness measurement machine. Along with assessing the volumetric wear, maximum linear penetration and taper contact length can also be determined. The method was applied to retrieved large head metal-on-metal femoral heads in order to quantify the material loss at this junction. Material loss from the female femoral head taper can be characterized as a localized area that is in contact with the stem taper surface. The study showed that this method has good repeatability and a low level of interoperability variation between operators.

Item Type: Article
Subjects: Q Science > QC Physics
T Technology > TJ Mechanical engineering and machinery
Schools: School of Computing and Engineering > Centre for Precision Technologies
School of Computing and Engineering > Centre for Precision Technologies > EPSRC Centre for Innovative Manufacturing in Advanced Metrology
School of Computing and Engineering > Centre for Precision Technologies > Surface Metrology Group
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Depositing User: Paul Bills
Date Deposited: 03 Mar 2015 11:48
Last Modified: 01 Dec 2016 21:57
URI: http://eprints.hud.ac.uk/id/eprint/23594

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