Chinese Journal of Clinical Anatomy >
The anatomical study of the entry point of axis pedicle screw by posterior nutrient foramens
Received date: 2014-02-23
Online published: 2014-12-04
Objective To determine the related linear and angular parameters about the new entry point (nutrient foramens) of C2 pedicle screw on computed tomography images. Methods 30 dry C2 vertebrae were obtained for anatomic measurement in the study. The posterior bilateral nutrient foramens of C2 lamina were selected as the entry points for pedicle screw placement. The foramens were marked with needles and then the vertebrae underwent computed tomography (CT) scan. The images of C2 pedicles were harvested and four linear and two angular parameters about the entry point were determined. Results The nutrient foramens exist in 97% of the left lamina and 93% of the right lamina of C2 vertebra. The overall mean distance from the entry point (nutrient foramen) to the superior border of lamina, to the inferior border of lamina, to the medial border of the pedicle were （3.36±0.57）mm, （8.41±1.08）mm and （6.91±1.20）mm, respectively. The length of the pedicle screw trajectory was （24.71±1.35）mm. The average transverse angle and the superior angle were（20.17±3.65）° and（31.02±5.71）°, respectively. Conclusion According to the measurement, the posterior bilateral nutrient foramens of the lamina can be used as a fixed landmark to locate C2 pedicle screw placement.
Key words： Axis; Nutrient foramen; Pedicle; Anatomical measurement
LIU Jia-Meng , JIANG Jian , LIU Zhi-Li , LONG Xin-Hua , CHEN Wen-Zhao , ZHOU Yang , GAO Song , HE Lai-Chang , HUANG Shan-Hu . The anatomical study of the entry point of axis pedicle screw by posterior nutrient foramens[J]. Chinese Journal of Clinical Anatomy, 2014 , 32(6) : 637 -639 . DOI: 10.13418/j.issn.1001-165x.201
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