Fig. 1
From: The method for measurement of the three-dimensional scoliosis angle from standard radiographs
Triple-point method for evaluation of the angle between the upper and lower endplates of the scoliosis curve based on computed tomography scans. The blue plane is parallel to the upper-end plate of the upper-end vertebra. The green plane is parallel to the lower endplate of the lower-end vertebra. The angle between the intersecting (spotted) lines is an angle between the mentioned planes (3D-scoliosis angle)