Figure 3.

Schematic drawing of the parameters. Radiograph showing several sagittal parameters measured in this study: CAC0–C2: angle between two lines on the inferior endplates of C0 and C2 that are extended until they intersect. CAC2–C7: angle between two lines on the inferior endplates of C2 and C7 that are extended until they intersect (A). T1-slope: angle between a horizontal line and a line parallel to the superior endplate of T1. C7 slope: angle between a horizontal line and the C7 upper endplate. cSVA: horizontal distance between the centers of C2 and C7 vertebral body (B).