Table 2.
Parameters of the S2 Alar-iliac Screw Trajectory for All Study Patients (n=120).
| Parameter | |
|---|---|
| Screw length (S) (mm) | 103.3 (86.4–110.5) |
| Screw length (L) (mm) | 108.1 (116.4–124.5) |
| Distance from the EP to the SIJ (S) (mm) | 28.2 (26.0–31.3) |
| Distance from the EP to the SIJ (L) (mm) | 31.2 (28.4–35.6) |
| Lateral angulation (S) (°) | 47.3 (43.6–51.8) |
| Lateral angulation (L) (°) | 40.7 (38.4–44.4) |
| Angle range (°) | 4.2 (0–6.9) |
| Caudal angulation (°) | −2.8 (−6.5–2.7) |
| Distance from the S2AIS to the acetabular roof (S) (mm) | 27.4 (23.9–32.1) |
| Distance from the S2AIS to the acetabular roof (L) (mm) | 23.5 (20.5–27.1) |
| Distance from the S2AIS to the sciatic notch (S) (mm) | 23.1 (19.9–27.1) |
| Insertion difficulty (number of screws) | 32 |
EP: entry point (of the S2 alar-iliac screw), SIJ: sacroiliac joint, S2AIS: S2 alar-iliac screw, S: shortest, L: longest
Data are presented as median with the first and third quartiles.