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Physiologic types of sagittal spinopelvic balance according to Roussouly. Type I: low pelvic incidence and low sacral slope with a short caudal lumbar lordosis and a thoracolumbar kyphosis. Type II: low pelvic incidence and low sacral slope with a flat back. Type III: normal pelvic incidence and normal sacral slope with a balanced lumbar lordosis and thoracic kyphosis. Type IV: high pelvic incidence and high sacral slope with an increased lumbar lordosis and a thoracic kyphosis
