Fig. 1From: Increasing pelvic incidence is associated with more global sagittal imbalance in ankylosing spondylitis with thoracolumbar kyphosis: an observational retrospective study of 94 casesa, Scatter diagram of SPA and PI. b, Scatter diagram of TPA and PI. SPA indicates spinopelvic angle; PI, Pelvic incidence; TPA, T1 pelvic angleBack to article page