寰椎后路椎弓根螺钉固定的解剖可行性研究

目的：探讨寰椎后路椎弓根螺钉固定的可行性。方法：利用50例干燥寰椎标本，电子游标卡尺测量其侧块中部、椎弓根以及后弓的宽度和高度。结果：寰椎侧块中部的宽度和高度分别是12．78mm和12．95mm；寰椎椎弓根的宽度和高度分别是8．57mm和5．83mm；椎动脉沟下方寰椎后弓的宽度为8．46mm，该部内侧1／3和外侧1／3的高度分别是3．88mm和4．25mm。结论：进行寰椎椎弓根螺钉固定是可行的，其决定因素是椎动脉沟处的寰椎后弓高度。

The anatomic study on the feasibility of posterior pedicle screw fixation on atlas

Objective: To study the feasibility of posterior pedicle screw placement on atlas. Methods: with an electronic digital caliper, 50 dry atlas specimens were used to measure the dimension of lateral mass, pedicle and posterior arch. Results: The mean width and height of the mid-portion of the C 1 lateral mass were 12.78 mm and 12.95 mm, and that of the C 1 pedicle were 8.57 mm and 5.83 mm,respectively. The mean width of C 1 posterior arch under the vertebral artery groove was 8.46 mm, and the height of this portion, 3.88 mm for medial one-third and 4.25 mm for lateral one third. Conclusions: It is possible to insert a pedicle screw on atlas, and the thickness of C 1 posterior arch under the vertebral artery groove was the main restrictive and decisive factors for C 1 pedicle screw placement.