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目的 为胸椎经椎弓根内固定的应用提供解剖学依据 ,设计一种胸椎经椎弓根内固定器。方法 用游标卡尺对 10具成人T1～ 11椎体干燥标本、 2 0份X线片、 2 0份MRI和CT片的椎弓根高度、宽度、长度、进钉点定位及椎弓根轴线的角度、椎弓根之间的宽度、椎弓根的毗邻等进行观测。结果 确定进钉点在上位椎体下关节突下缘的外缘线上 3mm处 ,与矢状线的夹角在 15°～ 2 0°,T4 以上椎体可容纳直径 5 0mm、长度 3 0～ 3 5cm的椎弓根螺钉 ,T4 以下椎体可容纳直径 4 5mm、长度 3 5～ 4 0cm的椎弓根螺钉。结论 胸椎经椎弓根螺钉可较安全地置入椎弓根 ,内固定器能很好的复位骨折椎体 ,间接减压椎管
Objective To provide anatomic basis for the application of thoracic pedicle screw fixation and to design a thoracic pedicle screw fixation. Methods The vertebral height, width, length, position of pedicle screw and pedicle axis of 10 adult T1 ~ 11 vertebral body dry specimens, 20 X-ray films and 20 MRI and CT films were measured by calipers. , The width of the pedicle, pedicle abutment and so on. The results confirmed that the entry point in the superior vertebral inferior border of the lower edge of the 3mm edge of the line, with the sagittal line angle of 15 ° ~ 20 °, T4 above the vertebral body can accommodate a diameter of 50mm, length 30 ~ 3 5cm pedicle screw, T4 below the vertebral body can accommodate a diameter of 4 5mm, length 3 5 ~ 40cm pedicle screws. Conclusion Thoracic pedicle screw can be safely placed in the pedicle, internal fixation can be a good reset vertebral fractures, indirect decompression spinal canal