2022 Volume 37 Issue 3 Pages 323-327
[Purpose] To identify preoperative factors influencing Japan Orthopaedic Association (JOA) scores after opening wedge high tibial osteotomy (OWHTO). [Participants and Methods] Seventy-seven knees of 68 patients, who had undergone OWHTO at Nagano Matsushiro General Hospital, were included to examine the following items: diagnosis, sex, age, Body Mass Index, femorotibial angle (FTA), range of motion (ROM), and knee isokinetic strength before surgery, and JOA scores before and 1 year after it. The knees were divided into full- and non-full-JOA-score groups to compare the preoperative factors between them. [Results] The full-JOA-score group’s rate of knee osteonecrosis (ON) as a diagnosis was significantly higher, preoperative FTA was significantly smaller, and preoperative knee flexion ROM was significantly greater. [Conclusion] The postoperative JOA scores of patients, in whom a diagnosis of knee ON led to surgery, and the degrees of varus deformity and loss of flexion were mild before it, were favorable.
