Objective To investigate the clinical efficacy of posterior subtotal vertebral dissection in patients with vertebral re-fractures of thoracolumbar segmental vertebroplasty. Methods Fifty-eight patients with thoracolumbar segmental vertebroplasty vertebral re-fractures treated in the orthopedic department of our hospital from January 2019 to January 2021 were randomly selected as study subjects.The patients were treated with posterior subtotal vertebral dissection, and the operating time and intraoperative bleeding of the patients were recorded, and the VAS pain score, posterior convex Cobb angle, vertebral body height, spinal canal volume ratio, and American Spinal Injury Association (ASIA) injury classification were compared in patients before and 6 months after surgery. Results The operating time was 1.4-3.8 hours, with a mean of (2.45±0.61) hours, and the intraoperative bleeding was 580-1470 mL, with a mean of (835.48±134.75) mL.The VAS pain scores at 6 months after surgery were lower than those before surgery (P<0.05); the posterior convex Cobb angle at 6 months after surgery was smaller than that before surgery (P<0.05); the vertebral body height and spinal canal volume ratio at 6 months after surgery were greater than those before surgery (P<0.05). Preoperative ASIA injury grading: 12 cases with grade A, 14 cases with grade B, 16 cases with grade C, 12 cases with grade D and 4 cases with grade E; six months after surgery, 5 cases with grade A, 8 cases with grade B, 13 cases with grade C, 15 cases with grade D, and 17 cases with grade E. Conclusion Posterior subtotal vertebral body resection could relieve pain of thoracolumbar vertebroplasty fractures, reduce the posterior convex Cobb angle, increase vertebral body height and spinal canal volume, and improve ASIA injury classification.