title: In vivo wear and migration of highly cross-linked polyethylene cups a radiostereometry analysis study.
abstract: In 50 cemented hip arthroplasties, wear and migration of the polyethylene (PE) cups were measured with radiostereometric analysis for a period of 2 years. Twenty had a normal gamma-in-air-sterilized PE, another 20 had a PE sterilized with 30000 Gy followed by heat stabilization (Duration; Stryker Orthopaedics, Mahwah, NJ), and 10 had highly cross-linked PE cups irradiated with 100000 Gy (Crossfire; Stryker Orthopaedics). In the initial 2 months, head penetration (creep) was 63 microm on average for the 3 groups. From 2 to 24 months, the mean proximal head penetration (wear) was 156 microm for standard PE, 138 microm for stabilized PE (P = .45), and 23 microm for highly cross-linked PE (P < .001; analysis of variance). The low in vivo wear rate for highly cross-linked cups was not at the expense of higher migration or less favorable clinical outcome and looks promising.
authors.affiliation: Department of Surgery and Perioperative Science, University of Umea, Sweden.
authors.forename: Stephan
authors.initials: S
authors.lastname: Röhrl
authors.forename: Bo
authors.initials: B
authors.lastname: Nivbrant
authors.forename: Li
authors.initials: L
authors.lastname: Mingguo
authors.forename: Ben
authors.initials: B
authors.lastname: Hewitt
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019544:Equipment Failure Analysis; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery; D011095:Polyethylenes; D011475:Prosthesis Failure
chemical_list: D011095:Polyethylenes