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Table 3 Correlation between sagittal parameters on lateral X-ray radiographs and the ideal S2AI screw trajectory parameters on CT imaging in deformity patients with AS

From: Does the thoracolumbar kyphosis secondary to ankylosing spondylitis affect the iliac trajectory of S2AI screw?

Parameters Left Right
GK PT SS GK PT SS
Sag angle r −0.227a − 0.618b 0.232a − 0.220a − 0.607b 0.284b
Tsv angle r 0.080 −0.243a 0.052 0.004 −0.239a 0.131
Max-length r −0.192 − 0.137 − 0.002 −0.304b − 0.176 −0.14
Sacral distance r −0.023 0.133 −0.084 0.026 0.103 −0.089
Iliac width r 0.043 0.458b −0.103 0.062 0.324b −0.096
S2 midline r 0.169 0.039 −0.079 0.133 0.445b −0.098
Skin distance r 0.148 −0.038 −0.238a 0.113 −0.053 − 0.250a
Iliac wing r 0.018 0.162 −0.139 −0.007 0.178 −0.052
PSIS distance r 0.062 −0.135 −0.201 0.063 −0.109 − 0.166
  1. PT Pelvic tilt, GK Global kyphosis, PSIS Posterior superior iliac spine
  2. aSignificant correlation was established at the 0.05 level
  3. bSignificant correlation was established at the 0.01 level