Table 5 Correlation between osteotomy parameters and the correction of SS, PT, TPA and SVA.

From: Prediction formulae of sagittal alignment in thoracolumbar kyphosis secondary to ankylosing spondylitis after osteotomy

Measurement

Sites of osteotomy

OVA correction (°)

SS correction (°)

 − 0.047

 − 0.014

PT correction (°)

 − 0.002

0.075

TPA correction (°)

0.206

0.697*

SVA correction (mm)

0.307*

0.365*

  1. SS sacral slope, PT pelvic tilt, TPA T1 pelvic angel, SVA sagittal vertical axis.
  2. *Indicates a statistically significant correlation (p < 0.05).
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