中文摘要：

目的应用数字技术探讨颈椎椎弓根进钉通道、进钉点与椎体边界位置之间的三维关系。方法采用Mimics 10.01软件对6例健康成人头颈部的连续CT扫描图像进行数字化分析,建立颈椎三维数字解剖模型,导入UG Imageware12.0。定位目标对象三维参照平面。将椎体由前至后分成10等份,以此作为定位分析椎弓根进钉通道边界深度比例的依据,由前至后将10等份标志线确定为椎体边界深度的100%～0%,获得C3～C7左右椎弓根进钉通道在椎体90%边界深度时的外偏角、通道长度及内切圆半径大小,确定最佳进钉点与椎弓根中部水平面的垂直距离、与椎弓根在0°外偏角和头尾偏角时投影内边界外侧线对应在椎板表面标志线之间的垂直距离以及与椎板侧块外侧边界的垂直距离。结果 （1）C3～C7椎弓根进钉通道内切圆半径逐渐增大,范围在2.6～3.8mm之间,其中C7最大,C3最小（左侧：2.6mm,2.7mm,2.9mm,3.1mm,3.4mm;右侧：2.5mm,3.0mm,3.1mm,3.1mm,3.8mm）。（2）C3～C7椎弓根进钉通道长度逐渐增大,范围在23.9～28.2mm之间,C7最大,C3最小（左侧：23.9mm,23.9mm,24.5mm,27.9mm,27.8mm;右侧23.4mm,23.8mm,24.5mm,26.7mm,28.2mm）。（3）C3～C7椎弓根进钉通道外偏角度范围在33.2°～37.9°之间（左侧：33.2°,33.2°,35.0°,35.3°,33.5°;右侧33.2°,37.9°,37.0°,36.3°,34.3°）。（4）C3～C7椎弓根进钉通道最佳进钉点到椎弓根中部水平面垂距分别为：左侧：-0.5mm,0.8mm,-0.3mm,-0.4mm,-0.5mm;右侧：-0.1mm,0.5mm,0.1mm,-0.3mm,-0.1mm,其中上方为正值,下方为负值。进钉点位于参考平面上下1mm左右。（5）C3～C7椎弓根进钉通道最佳进钉点到椎弓根外边界垂距分别为：左侧：-5.8mm,-5.3mm,-6.9mm,-5.7mm,-2.7mm;右侧：-5.4mm,-6.3mm,-6.5mm,-5.9mm,-3.0mm,内侧为正值,外侧为负值。其中C3～C6进钉点位于椎弓根外边界线外侧5～7mm之间,C7进钉点位于边界线外侧3mm左右。（6）C3～C7椎弓根进钉通道

英文摘要：

Objective To explore three-dimensional relations of pedicle screw channel （PSC）, screw entry point and lateral surface of cervical vertebral body by digital techniques. Methods CT scan images of cervical vertebra of 6 healthy adult were digitally analyzed by Mimics 10.01 software and their three-dimensional models were established. These data were saved as ^＊.stl format, then imported into UG Imageware 12.0 to perform computer aided design. Located at 3D coordinate system for the subject, the centrum was divided into 10 equal parts from front to back, and those 10 equal parts were taken as the standards of borderline depth. From front to back 10 equal parts mark lines on the centrum were determined to 100%-0% of borderline depth accordingly. The radius of inscribed circle, transverse screw angle （TSA） and PSC length in 90% borderline depth were gained, perpendicularity distances from best entering point to middle horizontal plane through pedicle, and to pedicle projection lateral borderline in 0° TSA of T3-T12 and to lateral borderline of lateral mass were determined respectively. Results 1. Inscribed circle radii of C3-C7 PSC increased gradually from 2.6 to 3.8 mm, radius of C7 PSC was biggest and that of C3 was smallest （left side： 2.6 mm, 2.7 mm, 2.9 mm, 3.1 mm, 3.4 mm; right side： 2.5 mm, 3.0 mm, 3.1 mm, 3.1 mm, 3.8 mm）. 2. The lengths of C3-C7 PSC increased gradually from 23.8 to 28.2 mm, length of C7 PSC was biggest and that of C3 PSC was smallest （left side： 23.9 mm, 23.9 mm, 24.5 mm, 27.9 mm, 27.8mm; right side： 23.4 mm, 23.8 mm, 24.5 mm, 26.7 mm, 28.2 mm）. 3. TSA scope of C3-C7 PSC was 33.2°-37.9° （left side： 33.2°, 33.1°, 35.0°, 35.3°, 33.5°; right side： 33.2°, 37.9°, 37.0°, 36.3°, 34.3°）. 4. Perpendicularity distances from ideal screw entry point corresponding on the lamina surface to middle horizontal plane through pedicle of C3-C7 were measured respectively： left side：-0.5 mm, 0.8 mm,-0.3 mm,-0.4 mm,-0.5 mm; right side：-0.1 mm, 0.5 mm, 0.10 mm,-0.3