To evaluate causes and results of revision arthroplasties in unstable total knee arthroplasties We retrospectively reviewed 24 knees that underwent revision arthroplasty for unstable total knee arthroplasty from December 2004 to December 2010. The mean age was 71.0(range, 54–85) years and the average follow-up period was 33.8 months (range, 6–70). The mean interval between the primary TKA and revision TKA was 82.5 months (range, 14–228). We classified the instability and analyzed the treatment according to its cases. Stress radiographs, postoperative component position and joint level were measured. Joint line position was measured using the fibular head as the reference point. Clinical outcomes were assessed using the Hospital for Special Surgery (HSS) score and range of motion. Wilcoxon sign rank test was employed for statistical analysis, and when p-value was over 0.05, it was analyzed as having statistical significances.Background:
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We compared patients, (group A) who had severe varus deformity with posterolateral varus thrust, with patients,(group B) who didn't have varus thrust for results of total knee arthroplasty. The average follow-up period was 33 months in group A (25 cases out of 23 patients) and 67 months in group B (50 cases out of 50 patients). We evaluated which kind of implant the patient had, the thickness of the polyethylene and changes of joint levels. Also we measured preoperative and postoperative mechanical axis deviation, tibio-femoral angle, and implant positions. Clinical results included preoperative and postoperative HSS, KSS, range of motion, and remained posterolateral instability on final follow-ups (Fig 1, Fig 2).Purpose:
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