title: Short-term wear of Japanese highly cross-linked polyethylene in cementless THA.
abstract: BACKGROUND
  Production of polyethylene wear from acetabular liners is thought, in part, to mediate the periprosthetic osteolysis. This study examined the in vivo wear performance of Japanese highly cross-linked polyethylene (Aeonian) in cementless total hip arthroplasty.
  
  
  METHODS
  Ninety-five hips received a highly cross-linked polyethylene liner, while 20 hips were implanted with conventional polyethylene. Two-dimensional linear wear was measured on radiographs and volumetric wear was then calculated. Both linear and volumetric wear rates were examined for the 1-year postoperative period as well as for the time frame beginning after 1 year ending with the final follow-up.
  
  
  RESULTS
  The amount of linear wear was significantly lower in the cross-linked group at 3 and 5 years postoperatively (P < 0.01 and < 0.001, respectively). Linear and volumetric wear rates after 1 year postoperatively for hips with the cross-linked polyethylene were significantly reduced by 57 and 59%, respectively, when compared to rates for those who received conventional polyethylene (P < 0.01). A multiple logistic regression analysis revealed that cross-linking was a significant factor influencing linear wear rate after 1 year postoperatively with an odds ratio, exp(ss) = 10.033 (P < 0.001).
  
  
  CONCLUSIONS
  These results suggest that the highly cross-linked polyethylene reduces penetration of the femoral head and may be an optimal bearing surface for patients receiving total hip arthroplasty.
authors.affiliation: Department of Orthopaedic Surgery, Kyushu Rosai Hospital, 1-3-1 Kuzuharatakamatsu, Kokuraminami-ku, Kitakyushu, Japan. keitamiya@jcom.home.ne.jp
authors.forename: Keita
authors.initials: K
authors.lastname: Miyanishi
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Hara
authors.forename: Shigekazu
authors.initials: S
authors.lastname: Kaminomachi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Maekawa
authors.forename: Mikio
authors.initials: M
authors.lastname: Iwamoto
authors.forename: Takehiko
authors.initials: T
authors.lastname: Torisu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D016015:Logistic Models; D008297:Male; D008422:Materials Testing; D008875:Middle Aged; D020959:Polyethylene / Q000737:chemistry*; D011475:Prosthesis Failure; D012189:Retrospective Studies
chemical_list: D020959:Polyethylene