To resolve the problem of the point and direction of the fixation of Axis lateral arch screw, using navigator finds the safe trajectory.

针对枢椎侧方椎弓螺钉固定时确定进针点和进针方向困难的问题，通过导航仪寻找安全钉道。

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Conclusion the superior lateral quadrant was the safe area of the cervical lateral mass screw. The safe exit point was the juncture between the transverse process and the facet.

结论颈椎侧块外上象限是螺钉植入的安全区，横突与关节突相交处是安全的出钉点。

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Objective: to go to more exact point and direction during the screw fixation make sure to insert screw successfully by measuring the dimension of the lower cervical spine pedicle.

实验目的：本文目的基于进行下颈椎椎弓根的相关经线及角度测量，定位更准确的椎弓根进钉点、置钉方向，为成功应用经颈椎椎弓根螺钉技术提供必要信息。

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"People have been trying to come up with a new screw for 100 years, to the point where you get sick of hearing about it, " LeVey says.

FORBES: The Taming of the Screw

And because by this point he was really quite afraid, he began humming to himself to screw up his courage.

NPR: Excerpt: 'Pinocchio'