T1 Pelvic and Lumbar Pelvic Angles Normative Values

TPA and LPA normative values are 7° and 6°, respectively, and vary between Roussouly morphotypes 1, 2, and 3 versus type 4. Using the midpoint of the superior endplate of T1 and L1 versus the centroid yielded similar results and therefore could be easier to use intraoperatively.