Fig. 2
From: Upright, prone, and supine spinal morphology and alignment in adolescent idiopathic scoliosis
The orientation of the upper and lower endplates of each individual vertebra of the computed tomography scans was determined by using the semi-automatic software, correcting for coronal and sagittal (a and b) tilt, to reconstruct the true transverse sections. The observer drew a contour around the vertebral body (yellow line in c) and spinal canal (blue line in c). The software calculated a center of gravity of the vertebral body (yellow dot in c) and spinal canal (blue dot in c). For each endplate, its longitudinal axis was calculated as the line between those two points (purple line in c). The rotation of this axis minus the rotation of the neutral sacral plate represents the rotation of the endplate