Axial CT image depicting transverse pedicle angle-Concave and convex sides with vertebral axis. It is the angle between the pedicle axis and a line parallel to the vertebral axis in the transverse plane. The vertebral axis is the line bisecting the angle between the lines formed by joining the junction of both laminae posteriorly (a) and one point each on the medial cortical wall where the lamina meets the pedicle (b and c). The transverse pedicle angle is formed by the angle between the pedicle axis p1-p2 and a line parallel to the vertebral axis p2-p3 on the concave side