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Lubricants 2015, 3(2), 475-492; doi:10.3390/lubricants3020475

Design of an Advanced Bearing System for Total Knee Arthroplasty

Smith and Nephew Advanced Surgical Devices, 1450 East Brooks Road, Memphis, TN 38116, USA
Formerly Smith and Nephew, Currently Orchid Orthopedic Solutions, 4600 East Shelby Drive, Suite 1, Memphis, TN 38118, USA
Author to whom correspondence should be addressed.
Academic Editor: J. Philippe Kretzer
Received: 26 March 2015 / Revised: 27 May 2015 / Accepted: 29 May 2015 / Published: 9 June 2015
(This article belongs to the Special Issue Tribological Performance of Artificial Joints)
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The objective of this study was to develop an advanced-bearing couple for TKA that optimizes the balance between wear resistance and mechanical properties. The mechanical and structural properties of virgin and highly crosslinked, re-melted UHMWPE were evaluated, and tibial inserts manufactured from these UHMWPE materials were tested against either oxidized zirconium (OxZr) or CoCr femoral components on a knee simulator. This study confirmed that the wear resistance of crosslinked UHMWPE improves with increasing radiation dose but is accompanied by a concomitant reduction in mechanical properties. Compared to CoCr, the ceramic surface of OxZr allows the use of a lower irradiation dose to achieve equivalent reductions in wear rates. As a result, a given wear rate can be achieved without sacrificing the mechanical properties to the same extent that is necessary with a CoCr femoral component. The advantage of ceramic counter bearing surfaces extends to both pristine and microabrasive conditions. View Full-Text
Keywords: highly crosslinked UHMWPE; knee; TKA; wear; mechanical properties; oxidized zirconium; abrasion; crosslink density highly crosslinked UHMWPE; knee; TKA; wear; mechanical properties; oxidized zirconium; abrasion; crosslink density

Figure 1

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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Morrison, M.L.; Jani, S.; Parikh, A. Design of an Advanced Bearing System for Total Knee Arthroplasty. Lubricants 2015, 3, 475-492.

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