Factors Affecting the Results of Proximal Tibia Opening Wedge Osteotomy

Abstract

Purpose : This study sought to perform proximal tibia opening wedge osteotomy on osteoarthritis patients, assess the treatment effect, and identify factors affecting clinical results. Materials and Methods : Nineteen patients (19 cases) who had opening wedge osteotomy at our hospital from November 1987 to May 1998, and were followed up on for at least 2 years were enrolled in the study. The follow-up period ranged from 2 years to 10 years and 4 months averaging 5.3 years. We analyzed those factors that affected the results of operation, such as age, weight, joint space narrowing and corrective angle. Results : Preoperative mean varus angle was 6.8 degrees and postoperative mean valgus angle 6.8 degrees. Mean valgus angle was 6.3 degrees at the final follow-up. Clinical assessment of the patients following the final follow-up showed: excellent in 8 cases, good in 8 cases, and fair in 2 cases. In addition, the remaining one case, assessed as poor, received total knee arthroplasty. The postoperative knee score was 86.310.6 in the lower age group, and 82.48.8 in the higher age group (p>0.05). The postoperative knee score was 89.25.2 in the non-obesity group, and 78.011.0 in the obesity group (p5.0 in the stage I group and 70.09.9 in stage II group (p10.8, 82.6 8.0 and 91.05.3, for those with postoperative valgus angles of below 5 degrees, 6 to 7 degrees, and over 8 degrees, respectively (p