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In X-ray and MRI Image, measurements of sagittal parameters of spinopelvic alignment (A and B) and the cross sectional-area (CSA) of the erector spinae (combined liocostalis and longissimus) and the vertebral body size (VB) on the inferior endplate of L1,2,3,4,5 axial (C). LL = lumbar lordosis, LA = lumbar vertebra angle, T1T = Lumbar 1 vertebra tilt angle. PI = pelvic incidence, PT = pelvic tilt, SS = sacral slope.
