Successful Correction of Sagittal Imbalance can be Calculated on the Basis of Pelvic Incidence and Age

Introduction Sagittal imbalance is an independent predictor of outcome in adult degenerative spinal deformity. Restoration of sagittal spinopelvic parameters correlates with a better postoperative outcome. Several methods of preoperative calculation for sagittal correction have been proposed, most of them are geometrical. A non-geometrical method, based on data of spinopelvic relationships in normal subjects that uses the patient’s pelvic incidence and age to calculate target lumbar lordosis and thoracic kyphosis is proposed. The goal of this study is to describe and validate this non-geometrical method in terms of sensitivity and specificity to predict satisfactory spinopelvic alignment.