The Nash and Moe method of determining vertebral rotation clinically. The apical vertebral body is divided into six equal segments longitudinally. When both pedicles are in view, there is no vertebral rotation. It is graded as “0”. When the pedicle in the concave side (the right side) starts disappearing, it is graded as “1”. When the pedicle disappears, it is graded as “2”. When the contralateral pedicle (pedicle in the convex side) is in the midline of the vertebra, it is graded as “3”. When it crosses the midline of the vertebra, it is graded as “4”.