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Table 4 Comparison of the bilateral S2AI screw trajectory parameters between genders in deformity patients with AS

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

Parameters Left Right
Male Female P Male Female P
Sag angle (°) 8.0 ± 11.2 9.6 ± 15.5 0.096 7.8 ± 12.9 9.4 ± 16.6 0.254
Tsv angle (°) 42.3 ± 6.6 44.3 ± 7.9 0.389 42.7 ± 7.5 46.0 ± 9.6 0.269
Max-length (mm) 111.7 ± 13.6 111.0 ± 16.0 0.417 112.7 ± 13.6 108.8 ± 20.6 0.389
Sacral distance (mm) 36.2 ± 5.8 37.8 ± 8.9 0.081 38.9 ± 5.5 36.7 ± 8.0 0.262
Iliac width (mm) 14.6 ± 4.0 12.5 ± 4.1 0.867 14.6 ± 4.2 12.3 ± 4.4 0.711
S2 midline (mm) 26.2 ± 3.6 27.3 ± 3.3 0.359 26.2 ± 3.9 27.2 ± 5.7 0.119
Skin distance (mm) 41.6 ± 14.6 40.4 ± 17.0 0.381 41.1 ± 14.0 39.7 ± 15.2 0.915
Iliac wing (mm) 12.8 ± 4.0 11.6 ± 2.0 0.209 12.8 ± 4.5 15.0 ± 3.8 0.991
PSIS distance (mm) 20.3 ± 12.0 22.9 ± 14.9 0.151 19.8 ± 12.4 22.1 ± 14.9 0.162
  1. PSIS Posterior superior iliac spine