S1 posterior sacral foramen parameter values
| Parameters | Total (n = 632) | Male (n = 287) | Female (n = 345) | |
|---|---|---|---|---|
| S1D (mm) | 11.0 ± 1.9 (4.9–17.5) | 11.5 ± 1.9 (7.1–17.5) | 10.6 ± 1.8 (4.9–17.4) | < 0.001 |
| S1W (mm) | 8.5 ± 1.6 (3.7–19.1) | 8.3 ± 1.6 (3.7–19.1) | 8.6 ± 1.6 (4.7–15.1) | 0.066 |
| S1A (°) | 29.2 ± 4.9 (12.5–45.8) | 28.2 ± 4.8 (12.5–44.7) | 30.1 ± 4.9 (18.5–45.8) | < 0.001 |
| S1ds (mm) | 23.5 ± 2.8 (16.2–32.2) | 24.1 ± 2.9 (17.8–32.2) | 22.9 ± 2.6 (16.2–32.2) | < 0.001 |
Values are presented as means ± standard deviation (min–max).
S1D: 1st posterior sacral foramen depth, S1W: 1st posterior sacral foramen width, S1A: angle of the 1st posterior sacral foramen, S1ds: 1st posterior sacral foramen distance.
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