title: Wear of ultra-high-molecular-weight polyethylene cup articulating with 22.225 mm zirconia diameter head in cemented total hip arthroplasty.
abstract: A number of studies have highlighted the increasing incidence of aseptic cup loosening with increasing depth of cup penetration by the metal head. We present our experience with a 22.225 mm diameter zirconia head on a 9-10 taper articulating with an ultra-high-molecular-weight polyethylene (UHMWPE) cup in cemented total hip arthroplasties. We prospectively studied the wear of the UHMWPE cup articulating with a 22.225 mm diameter zirconia head in cemented total hip arthroplasties. A total of 339 patients (153 men, 186 women, 373 hips) were included. The patients' mean age at surgery was 52 years (17-76 years), with 41% age 50 years or younger. Their mean weight was 72.4 kg (24-125 kg). At a mean follow-up of 4.3 years (0-8 years) the mean penetration rate of the cup was 0.03 mm/year (0-0.51 mm/year). Altogether, 289 (77.5%) showed no measurable wear, 38 (10.2%) had a penetration rate of 0.11 mm/year or less, 33 (8.9%) had a rate of 0.12-0.2 mm/year, and in 13 (3.5%) the rate was more than 0.2 mm/year. Ceramic-UHMWPE is the next stage in the evolution of total hip arthroplasty for addressing wear and any possible related issues.
authors.affiliation: The John Charnley Research Institute, Wrightington Hospital, Hall Lane, Appley Bridge, Nr. Wigan WN6 9EP, UK.
authors.forename: Michael
authors.initials: M
authors.lastname: Wroblewski
authors.forename: Paul D
authors.initials: PD
authors.lastname: Siney
authors.forename: Hagime
authors.initials: H
authors.lastname: Nagai
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Fleming
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011095:Polyethylenes; D011446:Prospective Studies; D011474:Prosthesis Design; D015040:Zirconium
chemical_list: D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D015040:Zirconium; C028541:zirconium oxide