Understanding the reactivity of CoCrMo-implant wear particles

Abstract

CoCrMo-based metal-on-metal hip implants experienced unexpectedly high failure rates despite the high wear and corrosion resistance of the bulk material. Although they exhibit a lower volumetric wear compared to other implant materials, CoCrMo-based implants produced a significantly larger 'number' of smaller wear particles. CoCrMo is nominally an extremely stable material with high Cr content providing passivity. However, despite the Co:Cr ratio in the original alloy being 2:1; chemical analyses of wear particles from periprosthetic tissue have found the particles to be composed predominately of Cr species, with only trace amounts of Co remaining. Here a correlative spectroscopy and microscopy approach has shown that these particles dissolve via a non-stoichiometric, and geometrically inhomogeneous, mechanism similar to de-alloying. This mechanism is previously unreported for this material and was not apparent in any of the regulatory required tests, suggesting that such tests are insufficiently discriminating.

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Item Type:	Article
Authors/Creators:	Koronfel, MA Goode, AE Weker, JN Tay, SER Stitt, CA Simoes, TA Mosselmans, JFW Quinn, P Brydson, R https://orcid.org/0000-0003-2003-7612 Hart, A Toney, MF Porter, AE Ryan, MP
Copyright, Publisher and Additional Information:	© The Author(s) 2018. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: 12 March 2018 Published (online): 12 March 2018 Accepted: 18 January 2018
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds)
Funding Information:	Funder Grant number EU - European Union NMP4-SL-2009-229244
Depositing User:	Symplectic Publications
Date Deposited:	15 Jun 2018 11:20
Last Modified:	25 Jun 2023 21:23
Status:	Published
Publisher:	Springer Nature
Identification Number:	10.1038/s41529-018-0029-2
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:131979

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Understanding the reactivity of CoCrMo-implant wear particles

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