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目的 运用CT三维重建技术探讨不同外偏角对颈椎理想椎弓根螺钉置入的影响及变化规律.方法 应用CT 三维重建技术对60例颈椎(C_(3～7))模拟进行椎弓根内固定术,并测节外偏角在10°～60°时理想螺钉的直径和长度.结果 C_(3～7)椎弓根在外偏角为10°～60°时,随着外偏角度数的增加,理想椎弓根螺钉的直径和长度均先增大到峰值后逐渐减小;在C_(3～6),外偏角为50°时,理想螺钉的直径达到最大值,分别为(4.3±0.7)、(4.4±0.7)、(4.8±0.8)和(5.3±0.9)mm;C_7理想螺钉的直径在外偏角为30±时达到最大值,为(6.3±0.9)mm.在螺钉外偏角为40°时,C_(3～7)理想螺钉的长度达到最大值,分别为(30.2±2.1)、(29.6±2.0)、(30.6±2.5)、(31.7±2.5)和(31.7±2.0)mm.结论 应用CT三维重建技术对不同外偏角时理想螺钉的直径和长度测量,可了解理想椎弓根螺钉的形态变化规律,对置入螺钉的形态和进钉角度的选择有指导意义.“,”Objective To explore the effects of transverse angle on the shape of ideal cervical pedicle screw by computed tomography (CT) three-dimensional reconstruction technology. Methods A total of 60 cases were performed CT scan, the ideal lengths and widths of cervical pedicle screw at transverse angle from 10° to 60° were measured by three-dimensional reconstruction technology. Results The ideal lengths and widths of the cervical pedicle screw from C_3 to C_7 increased to the peak and then diminished gradually at transverse angle from 10° to 60°. In C_3～C_6, the peak values of the widths of cervical pedicle screw were (4.3± 0.7), (4.4±0.7), (4.8±0.8) and (5.3±0.9)mm at the transverse angle of 50° respectively, and (6.3±0.9)mm in C_7 at the transverse angle of 30°. In C_3～C_7, the peak values of the lengths of cervical pedicle screw were (30.2±2.1), (29.6±2.0), (30.6±2.5), (31.7±2.5) and (31.7±2.0)mm at the transverse angle of 40° respectively. Conclusions Measuring the ideal widths and lengths of cervical pedicle screw at different transverse angles by CT three-dimensional reconstruction technology is helpful to understand the changes of ideal cervical pedicle screw shape, having an important impact on selection of the angles and the shapes of cervical pedicle screw.