title: In vivo wear performance of highly cross-linked polyethylene vs. yttria stabilized zirconia and alumina stabilized zirconia at a mean seven-year follow-up.
abstract: BACKGROUND
  Zirconia was introduced as an alternative to alumina for use in the femoral head. The yttria stabilized zirconia material was improved by adding alumina. We evaluated highly cross-linked polyethylene wear performance of zirconia in total hip arthroplasty. The hypothesis was that alumina stabilized zirconia could decrease highly cross-linked polyethylene wear.
  
  
  METHODS
  Highly cross-linked polyethylene wear was measured with a computerized method (PolyWare) in 91 hips. The steady-state wear rates were measured based on the radiographs from the first year postoperatively to the final follow-up and were compared between hips with yttria stabilized zirconia and alumina stabilized zirconia.
  
  
  RESULTS
  The steady-state wear rate of highly cross-linked polyethylene against zirconia was 0.02 mm/year at a mean follow-up of 7 years. No significant difference was observed between groups with yttria stabilized zirconia and alumina stabilized zirconia.
  
  
  CONCLUSIONS
  Addition of alumina to the zirconia material failed to show further reduction of highly cross-linked polyethylene wear and our hypothesis was not verified.
authors: Department of Orthopaedic Surgery, Mie University Graduate School of Medicine, Tsu City Mie 514-8507, Japan. masahase@clin.medic.mie-u.ac.jp
authors: Masahiro
authors: M
authors: Hasegawa
authors: Akihiro
authors: A
authors: Sudo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000537:Aluminum Oxide / Q000737:chemistry / Q000592:standards*; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000592:standards*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020959:Polyethylene / Q000737:chemistry / Q000592:standards*; D011474:Prosthesis Design / Q000592:standards; D055815:Young Adult; D015019:Yttrium / Q000737:chemistry / Q000592:standards*; D015040:Zirconium / Q000737:chemistry / Q000592:standards*
chemical_list: D015019:Yttrium; D020959:Polyethylene; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide; C091417:yttria
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