title: Minimum five-year follow-up wear measurement of longevity highly cross-linked polyethylene cup against cobalt-chromium or zirconia heads.
abstract: We investigated the efficacy of combining highly cross-linked polyethylene with ceramic heads on further reduction in polyethylene wear compared with the combination with cobalt-chromium heads via PolyWare computer-assisted method. A prospective cohort study was performed on 102 cementless total hip arthroplasties using Longevity (Zimmer, Warsaw, Ind) highly cross-linked polyethylene liners. Either 26-mm zirconia heads or 26-mm cobalt-chromium heads were randomly used in 51 hips each. At a mean follow-up of 6.7 years, no significant differences were identified between the groups for total penetration rate and steady-state wear rate. Osteolysis was not observed in any hips in either group. In conclusion, no advantage was seen for the 26-mm zirconia head compared with the 26-mm cobalt-chromium head in this period.
authors.affiliation: Department of Orthopaedic Surgery, Osaka University, Graduate School of Medicine, Suita, Osaka, Japan.
authors.forename: Ichiro
authors.initials: I
authors.lastname: Nakahara
authors.forename: Nobuo
authors.initials: N
authors.lastname: Nakamura
authors.forename: Takashi
authors.initials: T
authors.lastname: Nishii
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Miki
authors.forename: Takashi
authors.initials: T
authors.lastname: Sakai
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Sugano
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D002858:Chromium Alloys; D015331:Cohort Studies; D005260:Female; D005270:Femur Head / Q000000981:diagnostic imaging / Q000601:surgery; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D010014:Osteolysis / Q000453:epidemiology; D020959:Polyethylene; D011446:Prospective Studies; D011475:Prosthesis Failure; D011859:Radiography; D015040:Zirconium
chemical_list: D002858:Chromium Alloys; D020959:Polyethylene; D015040:Zirconium; C028541:zirconium oxide