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Lubricants 2017, 5(3), 25; doi:10.3390/lubricants5030025

Conventional and Highly Crosslinked Polyethylene in Total Knee Arthroplasty—A Design-Independent Wear Investigation

Department of Orthopedic Surgery, University Hospital of Munich (LMU), Campus Grosshadern, 81377 Munich, Germany
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Academic Editor: J. Paulo Davim
Received: 31 May 2017 / Revised: 7 July 2017 / Accepted: 10 July 2017 / Published: 16 July 2017
(This article belongs to the Special Issue Tribological Performance of Artificial Joints 2017)
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Abstract

Introduction: Improvement of total knee arthroplasty (TKA) materials is one promising approach for extending the lifetime of endoprostheses. The target of this study was to evaluate the sufficiency of TKA-design-independent rolling–sliding screening tests. Additionally, this study attempted to assess the relevance of the design of TKA systems for wear performance by comparison with a simulator study. Materials and Methods: A TKA-design-independent rolling–sliding testing machine was employed at ISO (the International Organization for Standardization) 14243-near conditions and physiologic level unidirectional rolling–sliding. Contact surfaces were generalized into elementary forms at curvatures of real endoprostheses: CoCr-cylinders on flat UHMWPE (ultra-high-molecular-weight-polyethylene) cuboids. Materials varied in resin and crosslinking. One conventional UHMWPE and three highly crosslinked polyethylenes were charged with an axial load of 2.5 kN for 5 million cycles. Wear was determined gravimetrically and the ranking was compared to a simulator study. Results: No statistically significant differences between either material were found. This was inconsistent with the results of a simulator survey. Conclusions: The results of the study indicate that this type of screening test is not able to correctly rank UHMWPE for use in TKA systems. The use of a UHMWPE plate in the test setup with a rolling–sliding cylinder is capable of producing visible wear marks in the bearing area, but the setup followed by a gravimetric measurement does not show reliable results. As the tested materials did not significantly vary in wear performance, it can be concluded that for differences in TKA wear-production, the design of TKR-systems can matter. View Full-Text
Keywords: rolling–sliding; UHMWPE; crosslinking; TKA; wear; debris; simulator rolling–sliding; UHMWPE; crosslinking; TKA; wear; debris; simulator
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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

Paulus, A.C.; Woicinzski, M.; Jansson, V.; Utzschneider, S. Conventional and Highly Crosslinked Polyethylene in Total Knee Arthroplasty—A Design-Independent Wear Investigation. Lubricants 2017, 5, 25.

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