研究设计：研究椎间盘前、后部分（分别为AD和PD）在调节C5-C6运动节段后方小关节面（PF）活动的生物力学作用。
Study Design. Biomechanical roles of anterior and posterior portions of the disc (AD and PD, respectively) in governing posterior facets (PF) behavior of a C5-C6 motion segment.
在生理情况下，AD和PD的轴位高度变化影响后方小关节面之间的间距与堆叠。
During a physiologic motion, axial disc height patterns at AD and PD affects the spacing and overlapping of articulating PF surfaces.
结果骶1进钉点在冠状位小关节上为小关节面下缘水平线与小关节突外缘交点；
Results Insertion site is better at the exterior aspect of the horigontal line of intervertebral facet joints in coronal, while in oblique and sagittal plane, 1-3mm furthor outward.
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