title: Massive failure of TiNbN coating in surface engineered metal-on-metal hip arthroplasty: Retrieval analysis.
abstract: This article presents examination of a failed total hip replacement with surface engineered metal-on-metal (MoM) articulation. The implant was coated with a thin TiNbN film (Physical Vapor Deposition), and at retrieval 53 months after implantation the coating was abraded on weight-bearing part of the head and acetabular component. Scanning electron microscopy of bearing surfaces demonstrated multifocal crack formation, delamination of small film fragments, and formation of aggregates containing nanometer sized wear debris. We also observed coating damage in third body mechanism. Complex failure mechanism of TiNbN coating demonstrated in this study suggests insufficient bonding strength between the coating and substrate alloy and raise concerns regarding the use of such coatings in total hip arthroplasty with MoM bearing. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 1043-1049, 2016.
authors.affiliation: Department of General Orthopaedics, Musculoskeletal Oncology and Trauma Surgery, Poznan University of Medical Sciences, Poznan, Poland.
authors.forename: Łukasz
authors.initials: Ł
authors.lastname: Łapaj
authors.affiliation: Department of General Orthopaedics, Musculoskeletal Oncology and Trauma Surgery, Poznan University of Medical Sciences, Poznan, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Markuszewski
authors.affiliation: Metal Forming Institute, Metal Examination Devision, Poznan, Poland.
authors.forename: Justyna
authors.initials: J
authors.lastname: Wendland
authors.affiliation: Metal Forming Institute, Surface Engineering and Tribology Laboraory, Poznan, Poland.
authors.forename: Adrian
authors.initials: A
authors.lastname: Mróz
authors.affiliation: Department of General Orthopaedics, Musculoskeletal Oncology and Trauma Surgery, Poznan University of Medical Sciences, Poznan, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Wierusz-Kozłowska
mesh_terms: D000497:Alloys / Q000737:chemistry*; D019644:Arthroplasty, Replacement, Hip; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008875:Middle Aged; D009556:Niobium / Q000737:chemistry; D011475:Prosthesis Failure; D014025:Titanium / Q000737:chemistry
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D009556:Niobium; D014025:Titanium
keywords: arthroplasty; bearing surfaces; coating(s); failure analysis; wear