title: Distinctive damage patterns on THA metal bearing surfaces: case studies.
abstract: Retrieval analysis of total joint arthroplasty components has primarily focused on assessing wear or other damage to polyethylene components. As damage to the opposing bearing surface can accelerate polyethylene wear and damage, and especially with the use of hard-on-hard articulations, retrieval analysis benefits from incorporating evaluation of hard bearing surfaces as well. The purpose of this study is to report six case studies of metal bearing surfaces with distinctive damage patterns, to interpret them in the context of adverse events plausibly responsible for their creation, and to suggest their likely clinical or scientific significance. The specific damage patterns reported here are 1) extensive scraping, 2) circumferential discoloration, 3) a long chain of periodic micro-indentations, 4) pitting with deposits, 5) scratches with small-radius directional changes, and 6) indentation with scraping.
authors.affiliation: Department of Orthopaedics and Rehabilitation University of Iowa, Iowa City, IA ; Department of Biomedical Engineering University of Iowa, Iowa City, IA.
authors.forename: Anneliese D
authors.initials: AD
authors.lastname: Heiner
authors.affiliation: Department of Materials Science and Engineering Ohio State University, Columbus, OH.
authors.forename: Nishant M
authors.initials: NM
authors.lastname: Tikekar
authors.affiliation: Department of Orthopaedics and Rehabilitation University of Iowa, Iowa City, IA ; Department of Biomedical Engineering University of Iowa, Iowa City, IA.
authors.forename: Karen M
authors.initials: KM
authors.lastname: Kruger
authors.affiliation: Department of Materials Science and Engineering Ohio State University, Columbus, OH.
authors.forename: John J
authors.initials: JJ
authors.lastname: Lannutti
authors.affiliation: Department of Orthopaedics and Rehabilitation University of Iowa, Iowa City, IA ; Department of Biomedical Engineering University of Iowa, Iowa City, IA.
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Brown
mesh_terms: D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008670:Metals / Q000009:adverse effects*; D011474:Prosthesis Design; D011475:Prosthesis Failure
chemical_list: D008670:Metals