The inferior wall was the inferior articular process of the same ordinal cervical vertebrae.
下壁为同序数椎骨下关节突基部。
Conclusions: the method that using the central point of C2 inferior articular process as a key anatomic landmark for determining the enter point of C1 pedicle screws is accurate and reliable.
结论：用枢椎下关节突中点作为术中判定寰椎椎弓根螺钉进钉点的方法准确可靠。
Conclusions: the method that using the central point of C2 inferior articular process as a key anatomic landmark for determining the enter point of C1 pedicle screws is accurate and reliable.
结论：用枢椎下关节突中点作为术中判定寰椎椎弓根螺钉进钉点的方法准确可靠。
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