title: Retrieval analysis of Harris-Galante I and II acetabular liners in situ for more than 10 years.
abstract: OBJECTIVE
  There have been few reports documenting the wear and oxidation performance of the polyethylene bearing surface of HGPI and HGPII THA devices. We evaluated retrieved HGPI and HGPII acetabular liners that had been in situ for more than 10 years and determined whether there was a relationship between clinical and radiographic factors, surface damage, wear, and oxidation.
  
  
  METHODS
  129 HGPI and II acetabular liners with implantation times of > 10 years were retrieved at 4 institutions between 1997 and 2010. The liners were made from a single resin and were gamma radiation-sterilized in air. Surface damage, linear wear, and oxidation index (OI) were assessed. Differences in clinical and radiographic factors, surface damage, linear wear, and OI for the 2 designs were statistically evaluated separately and together.
  
  
  RESULTS
  Articular surface damage and backside damage was similar in the 2 designs. The linear penetration rate was 0.14 (SD 0.07) mm/year for the HGPI liners and 0.12 (SD 0.08) mm/year for the HGPII liners. For both cohorts, the rim had a higher OI than the articular surface. 74% of the liners had subsurface cracking and 24% had a complete fracture through the acetabular rim.
  
  
  CONCLUSIONS
  Despite modification of the HGP locking mechanism in the HGPII design, dissociation of the liner from the acetabular shell can still occur if fracture of the rim of the liner develops due to oxidative degradation.
authors.affiliation: State University of New York Medical Center, NY, USA.
authors.forename: Keisha
authors.initials: K
authors.lastname: French
authors.forename: Rebecca
authors.initials: R
authors.lastname: Moore
authors.forename: Heather
authors.initials: H
authors.lastname: Gawel
authors.forename: Steven M
authors.initials: SM
authors.lastname: Kurtz
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Kraay
authors.forename: Ke
authors.initials: K
authors.lastname: Xie
authors.forename: Victor M
authors.initials: VM
authors.lastname: Goldberg
authors.forename: Clare M
authors.initials: CM
authors.lastname: Rimnac
mesh_terms: D000077:Acetabulum / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation*; D020878:Device Removal; D019544:Equipment Failure Analysis; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008422:Materials Testing / Q000379:methods; D011095:Polyethylenes; D011474:Prosthesis Design; D011475:Prosthesis Failure; D012044:Regression Analysis; D012189:Retrospective Studies; D018570:Risk Assessment; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D011095:Polyethylenes; C111601:ultra-high molecular weight polyethylene