Abstract: [Abstract] Objective To study the efficacy of thoracolumbar spinal fracture-dislocation treated with posterior short-segment pedicle instrument. Methods Under general anaesthesia, 25 cases were treated by posterior route reduction and laminectomy and short-segment pedicle screw internal fixation and bone grafting. To appraise the efficacy through comparing the anterior and posterior height of fractured vertebrae, the Cobb's angle, the cross-section area of spinal canal, the spinal alinement and the nerve function between preoperative and postoperative. Result All cases were followed up. Length of follow-up ranged from 8to 48months. Spinal alinement was reduced normally. The average anterior and posterior height of fractured vertebrae was 31.2%、76.8% preoperatively, 83.5%、92.6%postoperatively; Cobb's angle was 32.5°preoperatively, 7.6°postoperatively. The cross-section area of spinal canal was 36.5% preoperatively, 86.4% postoperatively. There was significant deference between pre-operation and post-operation(P<0.01). Nerve recovery: 2 cases of complete paraplegia had no recovery, others recovered 1～3 grades by Frankel.1 case of broken pedicle screws occurred. Conclusion Short-segment pedicle instrument is suitable for treating thoracolumbar spinal fracture-dislocation, which has advantages of simplicity, safety and less segment fixed, reduced spinal alinement.

Key words: Thoracolumbar junction, Fracture-Dislocation, Pedicle screw, Internal fixation