椎動脈高跨和頸2椎板螺釘

1、椎動脈高跨和頸2椎板螺釘（High-Riding Vertebral Artery /C2 laminar screws ）,俞武良 2018-3-21,C2 pedicle screw,,vertebral artery(VA),,VA injury,4.1% to 8.2% for posterior atlantoaxial transarticular screw fixation 5.3%–2

2、1% for C2 pedicular screw,,Factors contribute to VA injury VA groove (VAG) anomalyhigh-riding vertebral artery 14.5%–18% narrow C2 pedicle 9.5%–32% insertion of the screw extremely close to the VA,,HRVA defined as

3、having an isthmus height of ≤5 mm and/or an internal height of ≤2 mm on the sagittal image 2–3 mm lateral to the cortical border of the spinal canal at C2.,,narrow C2 pedicle defined as having the largest pedicular width