Abstract:

BACKGROUND: Ideal reset of the thoracolumbar fractures needs accurate pedicle screw placement angle to achieve the desired stress. In recent years, a variety of means have designed by the experts and scholars at home or abroad, almost all the means are aimed to design a plane with the reference of the anatomical structure of vertebral body or attachments, so accurate degree is not uniform.
OBJECTIVE: To analyze whether supraspinous line can be the identification marker of the sagittal screw angle of the pedicle of vertebral arch in the thoracolumbar surgery．
METHODS: A total of 49 cases of the nomal thoracolumbar MRI images and 21 cases of T₁₂ thoracolumbar fracture MRI images were included in the study to measure the angle of the vertebral body terminal plate parallel lines and the corresponding supraspinous lines. The comparison and statistical comparative analysis were performed.
RESULTS AND CONCLUSION: The angle of vertebral body terminal plate against supraspinous line was 90° at T₁₀-L₃, and was about 82° at L₄. The angle was not changed before and after thoracolumbar fracture. In the internal fixation surgery of thoracolumbar fracture, if the angle of vertebral body terminal plate against supraspinous line is about 90° at T₁₀-L₃ and 80° at L₄, the pedicle screw and terminal plate may be maintained in parallel basically. Supraspinous line can be the identification marker for sagittal screw angle of the pedicle of vertebral arch.