CT重建颈椎椎弓根轴线投影点的定位研究

目的通过CT测量C3-C7椎弓根所得的相关数据,提高椎弓根螺钉内固定术的准确性和安全性。方法采用高速螺旋CT扫描测量30例健康志愿者C3-C7椎弓根的置钉点与后正中线的距离、椎弓根松质骨宽度、椎弓根松质骨高度、椎弓根深度,根据所得数据重建出椎弓根的形态。结果CT重建显示C3-C7椎弓根松质骨宽度逐步变大,椎弓根的深度比较均一;椎弓根倾斜角度在33．76°-47．20°之间,C3-C7倾斜角度逐步变小;椎弓根进钉点与正中线的距离比较均一。各项数据左右侧之间没有显著差异,但男女性之间有显著差异。结论重建CT所得数据为临床颈椎椎弓根内固定提供重要参考。

Positioning study of cervical vertebra pedicle axial line projective point by CT image reconstruction

OBJECTIVE: To improve the safety and accuracy of trans-pedicle internal fixation for cervical vertebra by the parameter data measuring by CT reconstruction. METHODS: Thirty volunteers were enrolled and be subjected to high-speed spiral CT for getting the data of C3-C7. The data included pedicle point-midline distance, pedicle sponge width, pedicle angle. The cervical vertebra pedicle morphology were reconstructed. RESULTS: Reconstructed CT image data displayed that pedicle sponge width become larger and larger from C3 to C7; the pedicle depth didn't change significantly even from C3 to C7; pedicle angle become small from C3 to C7 and the range is from 33.76 degrees to 47.20 degrees; pedicle point-midline distance were almost similar even from C3 to C7. There were not statistical differences between the right side and the left side, but there were statistical differences between man and woman. CONCLUSION: Reconstructed CT image can provide useful data for clinical cervical vertebra trans-pedicle internal fixation.