目的 评估下颈椎经关节螺钉不同置钉技术的安全性.方法 8套成人颈椎CT数据,三维重建下透视模拟不同下颈椎经关节螺钉置钉技术,标记置钉点、出钉点.观察各节段钉道长度、出钉点与周围骨性结构的相关特征.结果 Klekamp法、Dalcanto法、Masakazu法在C_(3/4) C_(4/5),C_(5/6),C_(6/7)四种双节段3D模型上进出钉点之间的距离(即钉道长度)无显著性差异(P>0.05);Masakazu法、Klekamp法、Dalcanto法出钉点与其对应颈椎椎间孔内缘切线的距离表现为Masakazu法0.05). In terms of distances between the exit points and the lateral intervertebral foramina boundary, three different screw placement techniques appeared obviously differences (P0.05). In terms of distances between the exit points and the central points of the transverse foramens, Masakazu techniques had the shortest distance, while Dalcanto and Klekamp techniques had no differences (P>0.05). Conclusions Considering safe evaluation, Dalcanto technique is better than other two techniques.