Figure 2.

(a) Uncompensated single curve. Here the pelvic obliquity exacerbates trunk shift created by the degenerative scoliotic curve. Single curve with high left pelvic side ipsilateral to the single left apex lumbar curve, horizontal line demonstrating distance from center sacral line to L₁ coronal bisector. (b) Compensated single curve. The pelvic obliquity counteracts the effect of trunk shift that would be created by the degenerative scoliotic curve. Single curve with high right pelvic side contralateral to the single left apex lumbar curve, horizontal line demonstrating distance from center sacral line to L ₁ coronal bisector.