title: Impact of modern technique on long-term results of total condylar knee arthroplasty.
abstract: This study reports the 14-year survivorship for 106 consecutive total condylar knee arthroplasties implanted using modern technique. All were performed by a single surgeon and have been observed prospectively since 1979. Failure was defined as revision for any reason, or radiographic evidence of loosening of the components. Life-table analysis reveals a 95.6% clinical survival rate at 14 years, with no radiographically loose components. Confidence interval is +/- 4.2%. There were 4 revisions, but none for aseptic loosening, and there are no impending revisions. Thirty-seven patients (49 knees) were known to be deceased as of April 1993, and 8 other patients are lost to followup. Clinical results for patients with pre- and postoperative Hospital For Special Surgery knee scores show 72 knees rated excellent and 11 good (mean score, 90 points). The 4 failures were rated poor. Mean flexion was 100 degrees. Radiographs of 93 knees were evaluated using the criteria of the Knee Society. Average overall alignment was 5 degrees valgus. Radiolucencies were present in 29 of 78 femoral components with adequate radiographs, and averaged 1 mm in 1 zone. Tibial radiolucency was present in 42 of 93 tibiae, again averaging 1 mm in 1 zone, with no loose pegs. In comparison with the first series of total condylar prostheses, this series showed comparable clinical results, with improved radiographic results, and no radiographic failures.
authors.affiliation: Lenox Hill Hospital, New York, NY 10021.
authors.forename: C S
authors.initials: CS
authors.lastname: Ranawat
authors.forename: W F
authors.initials: WF
authors.lastname: Flynn
authors.forename: R G
authors.initials: RG
authors.lastname: Deshmukh
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000502:physiology; D007720:Knee Prosthesis / Q000379:methods*; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D011859:Radiography