Distance measurements from a predefined target point to the anterior sacral cortex for each of the 3 trajectories described (Fig 1)*
| Distance to Anterior Sacral Cortex from Target Point | Trajectory 1 | Trajectory 2 | Trajectory 3 |
|---|---|---|---|
| Mean ± SD | 11.3 ± 4.6 mm | 11.1 ± 9.2 mm | 12.8 ± 5.2 mm |
| <3 mm | 7 (3.5%) | 8 (4%) | 7 (3.5%) |
| 3–10 mm | 123 (61.5%) | 138 (69%) | 117 (58.5%) |
| >10 mm | 70 (35%) | 54 (27%) | 76 (38%) |
* Data from both the left and right hemisacrum were pooled, resulting in 200 measurements total.