title: Bearing-Foreign Material Deposition on Retrieved Co-Cr Femoral Heads: Composition and Morphology.
abstract: Bearing-foreign material deposition onto a femoral head can occur from contact with an acetabular shell due to dislocation, reduction, or subluxation. The purpose of this study was to comprehensively characterize deposit regions on retrieved cobalt-chrome femoral heads from metal-on-polyethylene total hip arthroplasties that had experienced such adverse events. The morphology, topography, and composition of deposition regions were characterized using macrophotography, optical profilometry, scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy. The deposit areas were relatively large, they were much rougher than the surrounding undamaged clean areas, and they displayed several distinct morphologies. Titanium alloy elements were the predominant constituents. Calcium and phosphorous were also detected within the deposit areas, in a composition that could nucleate abrasive hydroxyapatite. In addition, tungsten-rich particles, likely present as tungsten carbide, were observed on top of the titanium deposits. The increased roughness associated with these deposition features would be expected to accelerate damage and wear of the opposing liner and hence accelerate the development of osteolysis.
authors.affiliation: Department of Materials Science and Engineering, Ohio State University, 446 MacQuigg Laboratory, 105 W Woodruff Avenue, Columbus, OH 43210, USA.
authors.forename: Nishant M
authors.initials: NM
authors.lastname: Tikekar
authors.affiliation: Department of Orthopaedics and Rehabilitation, University of Iowa, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 01008 JPP, Iowa City, IA 52242, USA ; Department of Biomedical Engineering, University of Iowa, 1402 Seamans Center, Iowa City, IA 52242, USA.
authors.forename: Anneliese D
authors.initials: AD
authors.lastname: Heiner
authors.affiliation: Department of Orthopaedics and Rehabilitation, University of Iowa, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 01008 JPP, Iowa City, IA 52242, USA.
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Baer
authors.affiliation: Department of Orthopaedics and Rehabilitation, University of Iowa, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 01008 JPP, Iowa City, IA 52242, USA ; Department of Biomedical Engineering, University of Iowa, 1402 Seamans Center, Iowa City, IA 52242, USA.
authors.forename: Karen M
authors.initials: KM
authors.lastname: Kruger
authors.affiliation: Department of Biomedical Engineering, University of Iowa, 1402 Seamans Center, Iowa City, IA 52242, USA.
authors.forename: John J
authors.initials: JJ
authors.lastname: Callaghan
authors.affiliation: Department of Orthopaedics and Rehabilitation, University of Iowa, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, 01008 JPP, Iowa City, IA 52242, USA ; Department of Biomedical Engineering, University of Iowa, 1402 Seamans Center, Iowa City, IA 52242, USA.
authors.forename: Thomas D
authors.initials: TD
authors.lastname: Brown
authors.affiliation: Department of Materials Science and Engineering, Ohio State University, 446 MacQuigg Laboratory, 105 W Woodruff Avenue, Columbus, OH 43210, USA.
authors.forename: John J
authors.initials: JJ
authors.lastname: Lannutti
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip; D002858:Chromium Alloys; D005260:Female; D005547:Foreign Bodies / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D013499:Surface Properties
chemical_list: D002858:Chromium Alloys