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Table 2 Correlation coefficient(r) between PI and other sagittal parameters in AS patients and controls

From: Increasing pelvic incidence is associated with more global sagittal imbalance in ankylosing spondylitis with thoracolumbar kyphosis: an observational retrospective study of 94 cases

Correlation coefficient(r)PI
AS groupP valueControl groupP value
PT0.506< 0.001*0.601< 0.001*
SS0.1590.1270.722< 0.001*
SPA−0.504< 0.001*−0.2960.112
SSA−0.110.9190.803< 0.001*
TPA0.533< 0.001*0.2650.157
  1. AS ankylosing spondylitis; PI Pelvic incidence; PT Pelvic tilt; SS Sacral slope; TK Thoracic kyphosis; TLK Thoracolumbar kyphosis; LL Lumbar lordosis; SVA Sagittal vertical axis; GK Global kyphosis; SPA spinopelvic angle; SSA spinosacral angle; TPA the first thoracic vertebra pelvic angle
  2. *Statistically significant (P < 0.05)