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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 group

P value

Control group

P value

PT

0.506

< 0.001*

0.601

< 0.001*

SS

0.159

0.127

0.722

< 0.001*

TK

0.171

0.100

0.090

0.637

TLK

−0.67

0.522

−0.292

0.117

LL

−0.135

0.194

−0.540

0.002*

SVA

0.090

0.389

−0.163

0.389

SPA

−0.504

< 0.001*

−0.296

0.112

SSA

−0.11

0.919

0.803

< 0.001*

TPA

0.533

< 0.001*

0.265

0.157

  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)