Abstract:Abstract: [Objective] To introduce the surgical technique and preliminary clinical effect of modified zadek dorsal closed wedge calcaneus osteotomy in the treatment of Haglund syndrome.[Methods] From May 2019 to August 2021, 12 cases of Haglund syndrome were treated with modified dorsal closed wedge calcaneal osteotomy. The patient took the healthy side lying position, made a longitudinal incision on the anterolateral side of the Achilles tendon, exposed the insertion point of the Achilles tendon to clear the pathological bursa, and performed the osteotomy of the posterior superior calcaneal tubercle and the wedge osteotomy of the calcaneal body according to the preoperative design. After osteotomy, the wedge-shaped osteotomy area was closed to rotate and displace the Achilles tendon stop forward and upward, improve the Achilles tendon function and correct the deformity. Two half thread hollow screws were used to close and fix the osteotomy, and when necessary, Kirschner wire was added for temporary fixation. After operation, the ankle joint was fixed and protected with plantar flexor brace.[Results] All the 12 patients completed the operation successfully without serious complications. The follow-up period was 9~24 months. Compared with before operation, VAS score, AOFAS ankle posterior foot score and calcaneal FPA angle measured by imaging were significantly improved at the last follow-up (P<0.05). According to Arner Lindholm score, 10 cases were excellent, 2 cases were good, and the excellent and good rate was 100% (12/12). [Conclusion] The treatment of Haglund syndrome with improved operation can effectively relieve heel pain,correct calcaneal tubercle retrogression deformity and restore ankle function.