Foraminal height, root-to-pedicle, and RtSAP distances comparison from supine to prone.
| Variable | Supine Position, Mean (SD) | Prone Position, Mean (SD) | Paired Difference (95% CI) | P |
| Left Foraminal Height | ||||
| L3−L4 | 19.7 (2.2) | 19.4 (2.0) | 0.3 (−0.1, 0.7) | 0.172 |
| L4−L5 | 18.2 (1.7) | 18.2 (1.7) | 0.0 (−0.4, 0.3) | 0.859 |
| L5−S1 | 15.6 (2.0) | 16.4 (1.7) | −0.8 (−1.3, −0.3) | 0.001 |
| Right Foraminal Height | ||||
| L3−L4 | 19.5 (1.9) | 19.2 (2.1) | 0.4 (−0.1, 0.8) | 0.086 |
| L4−L5 | 18.3 (1.6) | 17.8 (2.0) | 0.4 (0.0, 0.9) | 0.039 |
| L5−S1 | 16.9 (2.0) | 16.5 (2.1) | 0.4 (−0.1, 0.8) | 0.093 |
| Left Root-to-Pedicle | ||||
| L3−L4 | 8.2 (1.8) | 8.6 (2.1) | −0.3 (−0.8, 0.1) | 0.166 |
| L4−L5 | 8.3 (1.8) | 8.1 (1.7) | 0.2 (−0.3, 0.6) | 0.442 |
| L5−S1 | 7.3 (1.9) | 7.4 (1.5) | −0.1 (−0.6, 0.3) | 0.519 |
| Right Root-to-Pedicle | ||||
| L3−L4 | 9.4 (1.8) | 8.8 (1.6) | 0.6 (0.0, 1.2) | 0.065 |
| L4−L5 | 9.0 (1.6) | 8.5 (1.8) | 0.5 (0.0, 1.0) | 0.055 |
| L5−S1 | 8.3 (1.3) | 8.2 (2.1) | 0.1 (−0.5, 0.6) | 0.811 |
| Left RtSAP | ||||
| L3−L4 | 2.3 (1.1) | 2.9 (0.9) | −0.5 (−0.8, −0.2) | 0.052 |
| L4−L5 | 2.6 (1.1) | 2.5 (0.7) | 0.1 (−0.2, 0.4) | 0.598 |
| L5−S1 | 2.5 (1.2) | 2.7 (0.8) | −0.1 (−0.5, 0.2) | 0.405 |
| Right RtSAP | ||||
| L3−L4 | 2.3 (1.1) | 2.4 (0.9) | −0.1 (−0.4, 0.2) | 0.434 |
| L4−L5 | 2.1 (1.0) | 2.4 (0.7) | −0.4 (−0.6, −0.1) | 0.003 |
| L5−S1 | 2.3 (1.1) | 2.6 (0.8) | −0.3 (−0.5, 0.0) | 0.049 |
Abbreviation: RtSAP, root-to-superior articular process.