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Definition of sagittal spino-pelvic parameters, including thoracic kyphosis, lumbar lordosis, and sagittal vertical axis (SVA) in (a), and T1 spino-pelvic inclination (T1-SPI) and T9 spino-pelvic inclination (T9-SPI) in (b). Circle in bottom right corner of b depicts the femoral head. (Reprinted with permission from: Schwab F, et al. Gravity line analysis in adult volunteers. Spine 31(25):E959–E967, 2006)
