During the surgery the longus collies muscle ,longus capitis muscle,anterior longitudinal ligament and atlantoax-ial articul ar capsules were cut.

• 后方固定方法包括:经寰枢侧块关节螺钉固定、寰枢侧块钉板固定和借助于枢椎椎弓根螺钉的枕颈固定。