Table 1:

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.