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Lubricants 2015, 3(1), 14-26; doi:10.3390/lubricants3010014

Wear Performance of Sequentially Cross-Linked Polyethylene Inserts against Ion-Treated CoCr, TiNbN-Coated CoCr and Al2O3 Ceramic Femoral Heads for Total Hip Replacement

1
Biomechanics and Implant Technology Research Laboratory, Department of Orthopaedics, University Medicine Rostock, 18057 Rostock, Germany
2
DOT GmbH, 18059 Rostock, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Amir Kamali and J. Philippe Kretzer
Received: 14 January 2015 / Accepted: 29 January 2015 / Published: 16 February 2015
(This article belongs to the Special Issue Tribological Performance of Artificial Joints)
View Full-Text   |   Download PDF [611 KB, uploaded 20 February 2015]   |  

Abstract

The aim of the present study was to evaluate the biotribology of current surface modifications on femoral heads in terms of wettability, polyethylene wear and ion-release behavior. Three 36 mm diameter ion-treated CoCr heads and three 36 mm diameter TiNbN-coated CoCr heads were articulated against sequentially cross-linked polyethylene inserts (X3) in a hip joint simulator, according to ISO 14242. Within the scope of the study, the cobalt ion release in the lubricant, as well as contact angles at the bearing surfaces, were investigated and compared to 36 mm alumina ceramic femoral heads over a period of 5 million cycles. The mean volumetric wear rates were 2.15 ± 0.18 mm3·million cycles−1 in articulation against the ion-treated CoCr head, 2.66 ± 0.40 mm3·million cycles−1 for the coupling with the TiNbN-coated heads and 2.17 ± 0.40 mm3·million cycles−1 for the ceramic heads. The TiNbN-coated femoral heads showed a better wettability and a lower ion level in comparison to the ion-treated CoCr heads. Consequently, the low volumes of wear debris, which is comparable to ceramics, and the low concentration of metal ions in the lubrication justifies the use of coated femoral heads. View Full-Text
Keywords: hip joint simulator; titanium niobium nitride; coating; contact angle; ion treatment; cross-linked polyethylene; wear hip joint simulator; titanium niobium nitride; coating; contact angle; ion treatment; cross-linked polyethylene; wear
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Fabry, C.; Zietz, C.; Baumann, A.; Bader, R. Wear Performance of Sequentially Cross-Linked Polyethylene Inserts against Ion-Treated CoCr, TiNbN-Coated CoCr and Al2O3 Ceramic Femoral Heads for Total Hip Replacement. Lubricants 2015, 3, 14-26.

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