[Analysis of the therapeutic effect of asymmetric T₁ pedicle osteotomy in the treatment of stiff cervical thoracic lateral kyphosis deformity].

<b>Objective:</b> To analyze the clinical efficacy of asymmetric T₁ transpedicular wedge resection Smith-Petersen osteotomy (T₁ SPO) in the treatment of stiff cervical thoracic lateral kyphosis deformity. <b>Methods:</b> This is a retrospective case series study. The clinical data of nine patients with stiff cervical thoracic kyphosis who underwent asymmetric T₁ SPO corrective treatment from June 2012 to October 2022 were collected. There were 7 males and 2 females, aged 45 to 68 years. The surgery time, intraoperative blood loss, and complications were recorded. The chin brow vertical angle (CBVA), cervical thoracic kyphosis Cobb angle, cervical thoracic scoliosis Cobb angle, and cervical thoracic sagittal axis (C₂-T₁ sagittal vertical axis, SVA) before surgery, after surgery, and at the last follow-up were measured and the correction rates were calculate. <b>Results:</b> All 9 patients successfully completed the surgery. The operation time ranged from 245 to 320 minutes, and the intraoperative blood loss was 1 400 to 2 200 ml. All patients were followed up for 24 to 48 months. The preoperative CBVA was 93.7° to 112.0°, which improved to 25.2° to 31.7° at the last follow-up, with an correction rate of 73.4%. The preoperative cervicothoracic kyphosis Cobb angle was -57.0° to -16.6°, which improved to 10.3° to 18.5° at the last follow-up, with an correction rate of 166.7%. The preoperative scoliosis Cobb angle was 13.0° to 16.5°, which improved to 2.2° to 3.8° at the last follow-up, with an correction rate of 84.9%. The preoperative SVA was 7.8 to 12.5 cm, which improved to 4.5 to 6.8 cm at the last follow-up, with an correction rate of 42.3%. One patient experienced numbness and weakness in the left hand after surgery, which recovered after 3 months. One patient had poor healing of the surgical incision, which healed after symptomatic treatment. During the follow-up, the coronal and sagittal balance of all patients was maintained, and no other neurological complications occurred. There were no cases of screw loosening, broken screws, or broken rods, or other internal fixation failures. <b>Conclusion:</b> The application of asymmetric T₁ SPO technique in the treatment of stiff cervical thoracic lateral kyphosis deformity can achieve relatively satisfactory correction effects.