目的  运用CT三维重建技术测量颈椎（C3～C7）理想椎弓根螺钉的形态并探讨临床意义。方法  应用CT三维重建技术对56例颈椎（C3～C7）进行模拟椎弓根内固定术，并对理想椎弓根螺钉的形态进行测量，包括理想螺钉的长度、直径、螺钉的偏角（外偏角）及矢状角。 结果  C3～C7理想椎弓根螺钉的长度分别为（28.2±1.9）、（27.9±2.1）、（29.7±2.0）、（30.8±2.3）、（30.6±2.4）mm；直径分别为（4.3±0.8）、（4.5±　0.8）、（4.9±0.8）、（5.4±0.9）、（6.2±0.9）mm；外偏角分别为（48±4）°、（50±5）°、（48±4）°、（43±4）°、（36±3）°；矢状角分别为（9±5）°、（6±4）°、（1±3）°、（-1±4）°、（-1±3）°。  结论   C3～C7椎弓根的形态变异范围较大，应用　CT三维重建技术模拟椎弓根内固定术，可测量理想椎弓根螺钉的形态并进行评估，对术中置入螺钉的角度和形态的选择有指导意义。

         Objective   To study the choice and the significance of the ideal cervical pedicle screw by the computed tomography of the three-dimensional reconstruction.  Method  A total of 56 cases were performed cervical pedicle screw fixation of cervical spine by the computed tomography of three-dimensional reconstruction, and measured the ideal shapes of the cervical pedicle screw, including the length, the width, the pedicle transverse angle and the pedicle sagittal angle.  Results   The ideal length of the cervical pedicle screw from C3 to C7 were (28.2±1.9), (27.9±2.1), (29.7±2.0), (30.8±2.3) and (30.6±2.4)mm; The ideal  width were (4.3±0.8), (4.5±0.8), (4.9±0.8), (5.4±0.9) and (6.2±0.9)mm; The ideal  pedicle transverse angle were (48±4)°, (50±5)°, (48±4)°, (43±4)° and (36±3)°; The ideal pedicle sagittal angle were (9±5)°, (6±4)°, (1±3)°, (-1±4)° and (-1±3)° respectively.  Conclusions   The shape of cervical pedicle was very variable. The ideal shapes of the cervical pedicle screw are measured and evaluated by the computed tomography of the three-dimensional reconstruction using the simulation of the operation of the cervical pedicle, having a large significance in selection of the angles and the shapes of the cervical pedicle screw.