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Coatings 2017, 7(7), 99; https://doi.org/10.3390/coatings7070099

Progress in Wear Resistant Materials for Total Hip Arthroplasty

1
Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, USA
2
Department of Biomedical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, USA
3
Harris Orthopaedic Laboratory, Massachusetts General Hospital, Boston, MA 02114, USA
4
Department of Orthopaedic Surgery, Harvard Medical School, Boston, MA 02115, USA
5
Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC 27695, USA
*
Author to whom correspondence should be addressed.
Received: 20 June 2017 / Revised: 3 July 2017 / Accepted: 5 July 2017 / Published: 9 July 2017
(This article belongs to the Special Issue Surface Chemical Modification)
View Full-Text   |   Download PDF [7173 KB, uploaded 9 July 2017]   |  

Abstract

Current trends in total hip arthroplasty (THA) are to develop novel artificial hip joints with high wear resistance and mechanical reliability with a potential to last for at least 25–30 years for both young and old active patients. Currently used artificial hip joints are mainly composed of femoral head of monolithic alumina or alumina-zirconia composites articulating against cross-linked polyethylene liner of acetabular cup or Co-Cr alloy in a self-mated configuration. However, the possibility of fracture of ceramics or its composites, PE wear debris-induced osteolysis, and hypersensitivity issue due to metal ion release cannot be eliminated. In some cases, thin ultra-hard diamond-based, TiN coatings on Ti-6A-4V or thin zirconia layer on the Zr-Nb alloy have been fabricated to develop high wear resistant bearing surfaces. However, these coatings showed poor adhesion in tribological testing. To provide high wear resistance and mechanical reliability to femoral head, a new kind of ceramic/metal artificial hip joint hybrid was recently proposed in which 10–15 μm thick dense layer of pure α-alumina was formed onto Ti-6Al-4V alloy by deposition of Al metal layer by cold spraying or cold metal transfer methods with 1–2 μm thick Al3Ti reaction layer formed at their interface to improve adhesion. An optimal micro-arc oxidation treatment transformed Al to dense α-alumina layer, which showed high Vickers hardness 1900 HV and good adhesion to the substrate. Further tribological and cytotoxicity analyses of these hybrids will determine their efficacy for potential use in THA. View Full-Text
Keywords: wear resistance; artificial hip joints; UHMWPE; ceramics; coatings; alumina/Ti alloy hybrid; cold spraying; cold metal transfer; micro-arc oxidation; total hip arthroplasty wear resistance; artificial hip joints; UHMWPE; ceramics; coatings; alumina/Ti alloy hybrid; cold spraying; cold metal transfer; micro-arc oxidation; total hip arthroplasty
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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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Khanna, R.; Ong, J.L.; Oral, E.; Narayan, R.J. Progress in Wear Resistant Materials for Total Hip Arthroplasty. Coatings 2017, 7, 99.

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