Song D, et al. - This study was undertaken to investigate the relationship between pelvic incidence (PI) and the spinopelvic parameters describing local deformity or global sagittal balance in ankylosing spondylitis (AS) patients with thoracolumbar kyphosis. Researchers examined a sum of 94 patients with AS (91 males and 3 females) and 30 controls (27 males and 3 females). They assessed sagittal spinopelvic parameters, including PI, pelvic tilt, sacral slope, thoracic kyphosis, thoracolumbar kyphosis, lumbar lordosis, sagittal vertical axis, the first thoracic vertebra pelvic angle, spinosacral angle and spinopelvic angle. Pearson correlation (r) and unary linear regression model were performed to analyze the association between PI and other spinopelvic parameters. This study's findings demonstrate that raising PI was significantly associated with more global sagittal imbalance, not with the local deformity in AS patients with thoracolumbar kyphosis.