title: Ten-year follow-up of a rotating-platform, posterior-stabilized total knee arthroplasty.
abstract: BACKGROUND
  The rotating-platform, posterior-stabilized knee was designed to decrease polyethylene wear and to address challenges associated with Low Contact Stress mobile-bearing knees. The purpose of the present prospective study was to investigate the long-term clinical and radiographic results and the survival rate for this implant.
  
  
  METHODS
  From January 2000 to October 2001, 117 consecutive patients (138 knees) underwent rotating-platform posterior-stabilized total knee arthroplasty with cement. All patients were followed prospectively. At a mean of 10 ± 0.4 years (range, 9.5 to eleven years) of follow-up, twenty patients had died and eight had been lost to follow-up, leaving eighty-nine patients (106 knees) for analysis.
  
  
  RESULTS
  A good to excellent result according to the Knee Society pain score, which improved from an average of 44 to 94 points, was achieved in 96% (eighty-five) of the eighty-nine patients in the final cohort. The mean knee motion improved from 111° to 119°. The prevalence of postoperative pain was 14%. The prevalence of asymptomatic crepitation was 9.4%, and the prevalence of painful crepitation requiring scar excision was 3.8%. Radiographic analysis revealed no malalignment, aseptic loosening, or osteolysis. There were three revisions: one for the treatment of infection and two for the treatment of traumatic supracondylar fractures. Kaplan-Meier analysis revealed that the ten-year survival rate was 100% with revision due to mechanical failure as the end point, 97.7% with revision for any reason as the end point, and 95% with any reoperation as the end point.
  
  
  CONCLUSIONS
  The ten-year follow-up of the rotating-platform, posterior-stabilized total knee arthroplasty demonstrated excellent clinical results and survival rates with no failures due to osteolysis or loosening.
authors.affiliation: Weill Medical College of Cornell University, Hospital for Special Surgery, 535 E. 70th Street, New York, NY 10021, USA. MeftahM@HSS.edu
authors.forename: Morteza
authors.initials: M
authors.lastname: Meftah
authors.forename: Amar S
authors.initials: AS
authors.lastname: Ranawat
authors.forename: Chitranjan S
authors.initials: CS
authors.lastname: Ranawat
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000502:physiology; D008297:Male; D008875:Middle Aged; D010149:Postoperative Pain; D011183:Postoperative Complications; D011446:Prospective Studies; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D012399:Rotation