This post-op CT scan (first image) and Photoshop-ed version showing a 3 degree rotation of S1 show the alarming alignment of the SIJs which would result from such a rotation. Note that the CT scan was taken in a lying down position and the SIJ alignment looks fine. So what does this mean about my mis-aligned fusuion theory? Does it mean that the 3-degree rotation is immaterial, or that when the MRI and CT scan were taken, I was lying down so the SIJs were in alignment but L5 and L4 were off? I'd need to go back and look more closely at L3-L5, presumably.