Dr. Richard Sawyer on Spinalogic's X-ray Analysis and On-screen Line Drawing

[Spinalogic]

Hi @chiswickchiropractor. Actually with a change in the pelvic morphology, both the optimal sacral base angle and the lumbar sagittal curvature (what you have termed 'lumbar ellipse') change. I refer you to Berthonnaud et al J Spinal Disord Tech. 2005 Feb;18(1):40-7 and Vialle et al J Bone Joint Surg Am. 2005; 87:260-267. But really if you think about it it's just logical. If someone had a greatly increased sacral base angle but a 'normal' lumbar curve, they couldn't stand upright.