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Variation in taper surface roughness for a single design effects the wear rate in total hip arthroplasty

Whittaker, RK; Hothi, HS; Eskelinen, A; Blunn, GW; Skinner, JA; Hart, AJ; (2017) Variation in taper surface roughness for a single design effects the wear rate in total hip arthroplasty. Journal of Orthopaedic Research , 35 (8) pp. 1784-1792. 10.1002/jor.23456. Green open access

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Abstract

Material loss from the head-stem taper junction of total hip arthroplasty (THA) is implicated in adverse reactions to metal debris (ARMD); the mechanisms for this are multi-factorial. We investigated the relationship between the roughness of the "as manufactured" taper surface and the wear rate from this junction. Fifty retrieved Pinnacle metal-on-metal (MOM) bearings paired with a Corail stem were included in the study. Multivariable statistical analysis was performed to determine the influence of taper roughness on material loss rate after controlling for other confounding surgical, implant, and patient factors. The surface roughness of the "as manufactured" head taper surface was associated with the rate of material loss from this surface. Four of eighteen roughness variables taken from ISO 4,287 and ISO 13,565-2 were significant: The Reduced Peak Height (Rpk, the protruding peaks above the core) (p = 0.004), Material Ratio 1 (Mr1, the ratio of the protruding peaks above the core) (p = 0.002), Area of the Peak Region (A1, the area of the Abbott-Curve that contains the peaks from the profile) (p = 0.003) and the Skewness (Rsk, the asymmetry of the height distribution corresponding to the height or depth of surface features) (p = 0.03). We found a large variability in the measured values with a median (range) of 0.50 (0.05-2.98), 11.98 (0.46-39.98), 30.89 (0.15-581.00), and 0.04 (-0.73-0.84), respectively. A 1-unit increase in Rpk was associated with a 73% increase in the taper wear rate. The variability of "as manufactured" surface roughness has a significant effect on taper material loss. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.

Type: Article
Title: Variation in taper surface roughness for a single design effects the wear rate in total hip arthroplasty
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/jor.23456
Publisher version: http://dx.doi.org/10.1002/jor.23456
Language: English
Additional information: This is the peer reviewed version of the following article: Whittaker, RK; Hothi, HS; Eskelinen, A; Blunn, GW; Skinner, JA; Hart, AJ; (2016) Variation in taper surface roughness for a single design effects the wear rate in total hip arthroplasty. Journal of Orthopaedic Research (In press), which has been published in final form at http://dx.doi.org/10.1002/jor.23456. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving
Keywords: Corrosion, hip, retrieval, taper, wear
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Surgery and Interventional Sci > Department of Ortho and MSK Science
URI: https://discovery.ucl.ac.uk/id/eprint/1519584
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