Fig. 1From: Incidence and risk factors of postoperative medial shoulder imbalance in Lenke Type 2 adolescent idiopathic scoliosis with lateral shoulder balanceThe projected distances of both spinous process and vertebral body edge from the vertebral center (A and B) are measured from the radiographic film. The displacement of the spinous process divided by the half of transverse diameter of the vertebra determine the vertebral rotation. Vertebral rotation ratio = A/B.Back to article page