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Table 1 Parameters of S1-AI screw trajectory measurements (mean ± standard deviation)

From: Proper detailed parameters for S1 sacral alar iliac screw placement in the Chinese population, a 3D imaging study

  Males (n = 30)    Females (n = 30)   
Parameters Left Right p Left Right p
Sag. A. (°) 57.21 ± 5.24* 55.68 ± 5.75* 0.455 59.52 ± 6.27 59.41 ± 5.35 0.760
Skin D. (mm) 53.06 ± 9.09 53.71 ± 9.56 0.853 57.35 ± 7.45 57.11 ± 6.78 0.927
Tsv. A. (°) 37.01 ± 2.39 37.10 ± 2.77 0.929 36.49 ± 2.79 37.24 ± 3.56 0.538
Max. L. (mm) 120.96 ± 4.03* 119.27 ± 4.34* 0.281 113.25 ± 6.11 111.69 ± 6.22 0.496
Sac. L. (mm) 41.50 ± 5.18* 42.91 ± 4.38* 0.425 39.90 ± 7.10 41.42 ± 5.58 0.520
Iliac W. (mm) 21.64 ± 4.17* 21.83 ± 3.76* 0.897 16.83 ± 1.59 17.25 ± 1.12 0.411
Ctx D. (mm) 8.31 ± 1.87* 8.46 ± 2.16* 0.850 5.69 ± 1.27 5.78 ± 0.86 0.687
Mid. D. (mm) 27.50 ± 1.51* 28.04 ± 2.47* 0.486 26.20 ± 2.92 26.67 ± 2.41 0.532
PSIS D. (mm) 27.41 ± 4.24* 27.48 ± 3.89* 0.964 22.30 ± 5.73 22.39 ± 5.41 0.851
  1. *Statistically significant if p < 0.05 compared with the data of females