title: Clinical Results and Survivorship of the GENESIS II Total Knee Arthroplasty at a Minimum of 15 Years.
abstract: The purpose of this study was to examine the 15-year survivorship and long-term clinical outcomes of the GENESIS II total knee arthroplasty (TKA).
  
  
  
  Patients who underwent TKA with the GENESIS II system between 1995 and 1999 were retrieved from our institutional database. We report a Kaplan-Meier survival analysis as well as Western Ontario and McMaster Universities Arthritis Index, the Short Form Health Survey-12 (SF-12), and the Knee Society Scores at a mean of 16 years.
  
  
  
  Four-hundred sixty-nine TKAs were performed with a mean patient age of 68 years. Patients were followed up prospectively for a mean of 16 years (range, 14.8-19.5 years). The Kaplan-Meier survival analysis at 15 years, with revision for any reason as the end point, was 96.4% (95.5%-97.3%). The Western Ontario and McMaster Universities Arthritis Index and the Knee Society Scores were significantly improved (P < .001) from the preoperative period to the latest follow-up. Patients had a significant improvement (P < .001) from the preoperative to the latest follow-up on the Physical Health Composite Score of the SF-12, but no change was noted on the Mental Health Composite Score of the SF-12.
  
  
  
  The unique design features of the GENESIS II TKA system have remained a constant over the duration of its clinical use, a rarity for contemporary TKA systems which are often altered before the publication of long-term results. The GENESIS II continues to demonstrate excellent long-term survivorship and improvements in health-related outcomes at a mean of 15 years, representing the standard for TKA systems at our institution.
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, Ontario, Canada.
authors.forename: Richard W
authors.initials: RW
authors.lastname: McCalden
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, Ontario, Canada.
authors.forename: Gavin P
authors.initials: GP
authors.lastname: Hart
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, Ontario, Canada.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: MacDonald
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, Ontario, Canada.
authors.forename: Douglas D
authors.initials: DD
authors.lastname: Naudie
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, Ontario, Canada.
authors.forename: James H
authors.initials: JH
authors.lastname: Howard
authors.affiliation: Division of Orthopaedic Surgery, London Health Sciences Centre, Western University, London, Ontario, Canada.
authors.forename: Robert B
authors.initials: RB
authors.lastname: Bourne
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000706:statistics & numerical data; D016208:Databases, Factual; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D053208:Kaplan-Meier Estimate; D007717:Knee / Q000601:surgery; D007719:Knee Joint / Q000601:surgery; D007720:Knee Prosthesis / Q000706:statistics & numerical data*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D057234:Preoperative Period; D012086:Reoperation / Q000706:statistics & numerical data; D016896:Treatment Outcome
keywords: GENESIS II; clinical results; long-term; survivorship; total knee arthroplasty