title: Corrosion on the acetabular liner taper from retrieved modular metal-on-metal total hip replacements.
abstract: Eight retrieved metal-on-metal total hip replacements displayed corrosion damage along the cobalt-chromium alloy liner taper junction with the Ti alloy acetabular shell. Scanning electron microscopy indicated the primary mechanism of corrosion to be grain boundary and associated crevice corrosion, which was likely accelerated through mechanical micromotion and galvanic corrosion resulting from dissimilar alloys. Coordinate measurements revealed up to 4.3mm(3) of the cobalt-chromium alloy taper surface was removed due to corrosion, which is comparable to previous reports of corrosion damage on head-neck tapers. The acetabular liner-shell taper appears to be an additional source of metal corrosion products in modular total hip replacements. Patients with these prostheses should be closely monitored for signs of adverse reaction towards corrosion by-products.
authors.affiliation: Orthopaedic Innovation Centre, Concordia Hip and Knee Institute, 1155 Concordia Avenue, R2K 2M9.
authors.forename: Trevor C
authors.initials: TC
authors.lastname: Gascoyne
authors.affiliation: Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Richard M
authors.initials: RM
authors.lastname: Dyrkacz
authors.affiliation: Orthopaedic Innovation Centre, Concordia Hip and Knee Institute, 1155 Concordia Avenue, R2K 2M9; Department of Surgery, Orthopaedics, University of Manitoba.
authors.forename: Thomas R
authors.initials: TR
authors.lastname: Turgeon
authors.affiliation: Orthopaedic Innovation Centre, Concordia Hip and Knee Institute, 1155 Concordia Avenue, R2K 2M9; Department of Surgery, Orthopaedics, University of Manitoba.
authors.forename: Colin D
authors.initials: CD
authors.lastname: Burnell
authors.affiliation: Orthopaedic Innovation Centre, Concordia Hip and Knee Institute, 1155 Concordia Avenue, R2K 2M9; Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Urs P
authors.initials: UP
authors.lastname: Wyss
authors.affiliation: Orthopaedic Innovation Centre, Concordia Hip and Knee Institute, 1155 Concordia Avenue, R2K 2M9; Department of Surgery, Orthopaedics, University of Manitoba; Department of Mechanical Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.
authors.forename: Jan-M
authors.initials: JM
authors.lastname: Brandt
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001672:Biocompatible Materials; D002858:Chromium Alloys; D003343:Corrosion; D020878:Device Removal; D005260:Female; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D014025:Titanium
chemical_list: D001672:Biocompatible Materials; D002858:Chromium Alloys; D014025:Titanium
keywords: Total hip arthroplasty; acetabular shell; corrosion; metal-on-metal; taper