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SRS-Schwab Adult Spinal Deformity Classification: A Validation Study based on evaluation of PI-LL (PI: pelvic incidence, LL: lumbar lordosis), SVA (sagittal vertical axis), and PT (pelvic tilt) for sagittal plane alignment, in addition to scoliotic deformity of the coronal plane with a Cobb angle ≥30°. PI-LL ≤10°, SVA <40 mm, and PT <20° were defined as the normal values to maintain quality of life (QOL).
