Objective: To investigate the efficacy of modified Maquet osteotomy for the treatment of patellofemoral joint disorders. METHODS: From May 2012 to May 2016, we used modified Maquet osteotomy to treat 54 knee joints in 42 patients, 17 males and 25 females; 32 right knees and 22 left knees; age 18~ 47 years old, with an average age of 29. The knee joint was evaluated by X-ray and CT before and after surgery, and the knee joint was tilted. All patients had a preoperative Q angle greater than 20°, with an average of 24.24±3.05, TT-TG>20mm, and an average of 22.45±3.23. The patient underwent an arthroscopic evaluation with a loosening of the lateral support band and a modified Maquet osteotomy. RESULTS: Intraoperative evaluation The intraoperative arthroscopic dynamic observation of the patellofemoral joint was good. When the knee joint was flexed and stretched, there was no close friction between the tibia and the femur in the cartilage injury area. Postoperative follow-up was 24-36 months. The preoperative and postoperative Lysholm scores were 58 and 92, respectively (P<0.05). Parameters of the patellofemoral joint: Q angle, suitable angle, lateral patellofemoral angle, tilt Angle, sacral tilt angle and TT-TG were significantly improved compared with preoperative, which was statistically significant. Conclusion: Our modified Maquet osteotomy preserves thick cancellous bone, avoids the posterior shift of the sagittal plane due to internal movement of the tibial tuberosity, and reduces the incidence of long-term patellofemoral osteoarthritis; According to the tibial joint trajectory, the position of the bone block can be flexibly adjusted.