Fig. 2

The yellow line is the median sagittal line, and the red line is the tangent line that runs parallel to the yellow line through the inner edge of the contralateral pedicle. The intersection point by intersecting the red line with the anterior border of the fractured vertebra is point A. Point B is the puncture-side pedicle’s center; point C is the puncture site; the distance CD should be measured before surgery; ∠CAE is the abduction angle. The purple line runs parallel to the fractured vertebra’s inferior border; ∠BFG is the sagittal inclination angle