The technique of free hand insertion with the lateralmass screw of atlas and vertebra dentata pedicle screw is simple, fixation is reliability and is well worth to spreading.
寰椎侧块螺钉与枢椎椎弓根螺钉徒手植入技术简单、可靠，值得推广。
2
Posterior screw fixation on atlas includes posterior screw fixation within lateralmass of atlas and in atlas via posterior arch and lateralmass.