Abstract:[Objective] To investigate the clinical outcomes of calcaneoplasty and reattachment of Achilles tendon in the treatment of Haglund syndrome. [Methods] A retrospective study was performed on 26 patients who underwent calcaneoplasty and reattachment of Achilles tendon for Haglund syndrome in our hospital from January 2017 to January 2019. The clinical and radiological documents were evaluated. [Results] All the patients had the surgical procedures performed successfully without any complications such as vascular and nerve injury, whereas with operation time of (58.3±17.9) min, intraoperative blood loss of (50.8±22.6) ml, and hospital stay of (6.8±1.1) days. All of them were followed up for (22.3±9.5) months on an average. With time elapsed preoperatively, 6 and 12 months postoperatively and the latest follow-up, the VAS score significantly reduced [(5.3±2.0), (2.5±1.2), (1.2±0.9), (1.2±0.8), P＜0.05], whereas the AOFAS score [(62.6±8.4), (80.6±7.6), (87.9±6.7), (89.7±5.1), P＜0.05] and ankle dorsal extension- plantar flexion range of motion (ROM) [(33.5±9.0)°, (54.0±9.2)°, (61.3±7.7)°, (64.8±9.4)°, P＜0.05] significantly increased. Radiographically, compared with those preoperatively, the parallel pitch lines (PPL) positive ratio (61.5% vs 0%, P＜0.05) and posterior calcaneal angle (Fowler-Philip angle, FPA) [(61.8±5.8) ° vs (41.3± 5.6)°, P＜0.05] significantly decreased postoperatively. [Conclusion] The open calcaneoplasty and reattachment of Achilles tendon have clear exposure to remove the complicated pathology involving various tissues, and achieve satisfactory clinical outcomes.