抄録
Background: For patients with osteoarthritis of the knee who experience persistent deep flexion pain, we offer, at our institution, the option of unicompartmental knee arthroplasty (UKA) using the Oxford high-flex knee prosthesis (Biomet, Warsaw, Indiana, USA), which is designed for deep flexion. We report the outcome of patients treated with the Oxford implant.
Methods: Twelve patients (1 man, 11 women) with a mean age at the time of surgery of 67.1 (range: 54-78) years with a preoperative Japanese Orthopaedic Associate score of 61.7 (range: 40-75) points were included in the study. Preoperatively, all patients experienced pain when climbing or descending stairs or squatting. The mean time since surgery was 15.6 (range: 6-24) months.
Results: All symptoms improved after surgery. The mean flexion angle improved from 134.5° (range: 100°-140°) before surgery to 140° (range 130°-150°) after surgery. Of the various items scored, the pain score for climbing and descending stairs improved from a preoperative 11.3 points (range: 5-15) to a postoperative 20 points (all scored 20 points).
Conclusion: Preoperative pain during flexion improved after surgery in all cases, suggesting that UKA is an effective treatment method.
