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Sagittal spinal radiographic parameters.
Left: Thoracic Kyphosis measured from superior endplate of T4 to inferior endplate of T12 and lumbar lordosis measured from superior endplate of T12 to superior endplate of S1.
Center: SVA defined as horizontal offset from center of C7 vertebral body to posterosuperior corner of S1.
Right: T1 and T9 spino-pelvic angle, defined as an angle between the vertical plumb line and line joining the hip axis to the center of T1 or T9 vertebral body.
