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Degree of rotation of the “Apical Vertebra (shown in Fig. 3)” in axial plane was measured in each case using the 3D image reconstruction software. (The angle of rotation about the longitudinal axis relative to the sagittal plane is shown in this figure. It is the angle between “the line through the dorsal central aspect of the vertebral foramen and the middle of the vertebral body” and “the sagittal plane”)
