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Segmental kyphotic deformity. A: Wedge fracture of T12; B: Local vertebral kyphosis angle; C: Regional kyphosis; D: Segmental kyphosis (SK). One vertebra, one disc=one segment. Sagittal index (SI): SI = SK-X (X = +5 in the thoracic spine, X = -10 in the lumbar spine, X = 0 in T12-L1).
