title: Hip dislocation increases roughness of oxidized zirconium femoral heads in total hip arthroplasty: an analysis of 59 retrievals.
abstract: The aims of this study were to assess damage on the surface of retrieved oxidized zirconium (OxZr) metal femoral heads, to measure surface roughness of scratches, and to evaluate the extent of surface effacement using scanning electron microscopy (SEM). Ceramic zirconia-toughened alumina heads were analyzed for comparison. OxZr femoral heads explanted for recurrent dislocation had the most severe damage (P<0.001). The median surface roughness of damaged OxZr femoral heads was 1.49μm, compared to 0.084μm for damaged ceramic heads and 0.052μm for undamaged OxZr (P<0.001). This may be of clinical concern because increased surface roughness has the potential to increase the wear of polyethylene liners articulating against these OxZr heads in THA.
authors.affiliation: Hospital for Special Surgery, New York, New York.
authors.forename: Mohamed E
authors.initials: ME
authors.lastname: Moussa
authors.affiliation: Hospital for Special Surgery, New York, New York.
authors.forename: Christina I
authors.initials: CI
authors.lastname: Esposito
authors.affiliation: Hospital for Special Surgery, New York, New York.
authors.forename: Marcella E
authors.initials: ME
authors.lastname: Elpers
authors.affiliation: Hospital for Special Surgery, New York, New York.
authors.forename: Timothy M
authors.initials: TM
authors.lastname: Wright
authors.affiliation: Hospital for Special Surgery, New York, New York.
authors.forename: Douglas E
authors.initials: DE
authors.lastname: Padgett
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000537:Aluminum Oxide; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D001672:Biocompatible Materials; D002516:Ceramics; D020878:Device Removal; D019544:Equipment Failure Analysis; D005260:Female; D006617:Hip Dislocation / Q000209:etiology*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008855:Microscopy, Electron, Scanning; D008875:Middle Aged; D011095:Polyethylenes; D011474:Prosthesis Design; D011475:Prosthesis Failure; D015040:Zirconium
chemical_list: D001672:Biocompatible Materials; D011095:Polyethylenes; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide
keywords: bearing; dislocation; hip arthroplasty; oxidized zirconia; roughness