对称性可调节式椎弓根钻孔导向器的研制及应用

目的：研制一种椎弓根钉钻孔导向器供术中使用，提高椎弓根螺钉置入的成功率及置入质量。方法：根据术前CT及X线片测定的水平面椎弓根钉置入角(TSA)、矢状而椎弓根钉置入角(SSA)及进钉点间距的数据，应用该钠孔导向器引导术中椎弓根螺钉钻孔操作。临床应用于21例胸腰椎骨折及腰椎滑脱患者，置入椎弓根钉84枚。结果：术后CT及X线片显示全部椎弓根钉置入位置准确，两侧椎弓根螺钉对称，具有相同或相近的SSA及TSA。结论：该钻孔导向器设计合理，使用方便，能提高椎弓根螺钉置入的准确性，可提高固定钉的安置质量。

The development and use of symmetric adjustable pedicle drilling guild

Objective:To develop a kind of pedicle drilling guid for operation in order to improve the successful rate and quality of positioning pedicle screw.Method:To guild the pedicle screw accurately during operation on the basis of the digital data of the transverse screw angle and sagittal screw angle from CT and X-ray before operation.Result:We improved the quality of pedicle screw by using the method mentioned above.Through the CT and X-ray,we found:all placed pedicle screw was accurate;the screws on the two sides of pedicle were symmetric with the same or similar transverse screw angles and sagittal screw angles.Conclusion:The drilling guild is reasonable in design and convenient in use.Besides,it can improve the accuracy and quality of placing pedicle screw and the intensity of fixation.