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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