Radiographical Predictors for Postoperative Sagittal Imbalance in Patients With Thoracolumbar Kyphosis Secondary to Ankylosing Spondylitis After Lumbar Pedicle Subtraction Osteotomy

In Brief Study Design. A retrospective radiographical study. Objective. To identify the radiographical predictors for sagittal imbalance in patients with thoracolumbar kyphosis secondary to ankylosing spondylitis (AS) after 1-level lumbar pedicle subtraction osteotomy (PSO). Summary of Background Data. Few studies had correlated the preoperative sagittal parameters with postoperative sagittal alignments to determine the radiographical predictors...