Ebraheim N A, Fow J, Xu R, Yeasting R A
Medical College of Ohio, Toledo, Ohio 43614, USA.
Spine (Phila Pa 1976). 2001 Feb 15;26(4):E34-7. doi: 10.1097/00007632-200102150-00002.
This is an anatomic and radiologic study on the lateral mass of the C2 vertebra.
To define the location of the pedicle and pars interarticularis in the C2 vertebra.
Transpedicular screw fixation of the C2 has been addressed in the literature. However, the use of the anatomic terminology of the pedicle or pars interarticularis (isthmus) in C2 is confusing in most of orthopaedic and neurosurgical literature since C2 is considered a transitional vertebra.
Twenty dry C2 vertebrae were obtained for observation of the external anatomy of the C2 from superior, lateral, and inferior views. Six C2 vertebrae were harvested from cadavers and sectioned in the sagittal, horizontal, and coronal planes to observe the internal structures of the lateral mass using high resolution radiographs.
Based on observation, the pedicle of the C2 vertebra is defined as the portion beneath the superior facet and anteromedial to the transverse foramen. The pars interarticularis or isthmus is defined as the narrower portion between the superior and inferior facets. No remarkable difference in bone density and trabecular bone orientation between the pedicle and pars interarticularis was noted.
It is still more appropriate to call this procedure "transpedicular screw fixation" in the C2 to avoid confusion, although this technique requires placing a screw from the posterior aspect of the inferior articular process through the isthmus and pedicle into the vertebral body.
这是一项关于C2椎体侧块的解剖学和放射学研究。
明确C2椎体椎弓根和关节突部的位置。
文献中已探讨了C2椎体的经椎弓根螺钉固定术。然而，在大多数骨科和神经外科文献中，由于C2被视为过渡椎体，C2椎弓根或关节突部（峡部）的解剖学术语使用存在混淆。
获取20个干燥的C2椎体，从上方、侧面和下方观察C2的外部解剖结构。从尸体上获取6个C2椎体，并在矢状面、水平面和冠状面进行切片，使用高分辨率X线片观察侧块的内部结构。
基于观察，C2椎体的椎弓根被定义为上关节面下方、横突孔前内侧的部分。关节突部或峡部被定义为上、下关节面之间较窄的部分。椎弓根和关节突部之间的骨密度和小梁骨方向无显著差异。
尽管该技术需要从下关节突的后侧将螺钉穿过峡部和椎弓根置入椎体，但在C2中仍更适合将此手术称为“经椎弓根螺钉固定术”，以避免混淆。
