title: In vivo wear reduction of argon compared to air sterilized UHMW-polyethylene liners.
abstract: BACKGROUND
  To date, no studies have been published that report on the in vivo advantages of sterilisation in argon (ARGON) versus air (AIR) of UHMWPE liners with respect to wear extend and pattern in uncemented total hip arthroplasty.
  
  
  METHODS
  Femoral penetration rates were measured in 93 AIR and 79 ARGON liners, during a mean follow-up of 8 (3-12) years.
  
  
  RESULTS
  During the first 3 years after implantation, both groups showed no differences in mean wear rate (P = 0.13). Thereafter, the ARGON liner demonstrated a decrease in wear rate of 0.04 mm/year from 4 to 6 years (P = 0.006), 0.14 mm/year from 7 to 9 years (P < 0.001), and 0.33 mm/year beyond 9 years follow-up (P = 0.015) compared to the AIR liner. One AIR acetabular component required revision.
authors.affiliation: Department of Orthopaedic Surgery and Traumatology, Isala Clinics, P.O. Box 10500, 8000 GM, Zwolle, The Netherlands. j.h.m.goosen@isala.nl
authors.forename: J H M
authors.initials: JH
authors.lastname: Goosen
authors.forename: C C P M
authors.initials: CC
authors.lastname: Verheyen
authors.forename: B J
authors.initials: BJ
authors.lastname: Kollen
authors.forename: N J A
authors.initials: NJ
authors.lastname: Tulp
mesh_terms: D000328:Adult; D000368:Aged; D000388:Air; D001128:Argon; D019644:Arthroplasty, Replacement, Hip; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011095:Polyethylenes; D013242:Sterilization / Q000379:methods*; D055815:Young Adult
chemical_list: D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene; D001128:Argon