Fig. 1.

Illustrations of the measured vertebral parameters. The vertebral parameters in the current study were calculated using the following formulas based on vertebral dimensions (a–f). (1) Vertebral body sagittal wedging = 2arctan {[(Centrum dorsal height (a) – Centrum ventral height)(b)/2]/Centrum anterior posterior diameter (c)}); (2) Relative spinous process thickness = spinous process thickness (d)/Centrum dorsal height (a). (3) Relative superior interfacet width: superior interfacet width (e)/superior VB width (f)