Before definitive cut and transposition of the vessels, the distance to the affected vertebra has to be estimated to certify enough pedicle length.
在最后切断和移植血管之前，一定充分估计距离目的椎体的距离以免血管蒂长度不够。
2
The technique of free hand insertion with the lateral mass 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。
3
At the same time, injuries to pedicle and vertebra caused by pullout ofpedicle screw were observed.