Table 5.
Comparison of dimensions of the dural sac on postoperative MRI according to position
| Postoperative supine MRI (n = 9) | Postoperative prone MRI (n = 20) | Mean difference in mm (±SD) | P value | ||
|---|---|---|---|---|---|
| Radiologist 1 (R.B.) | Mean height in mm (±SD) | 15.7 (±2.8) | 12.8 (±2.8) | −2.22 (±1.9) | 0.007 |
| Mean width in mm (±SD) | 12.8 (±2.3) | 12.5 (±3.4) | −1.56 (±3.0) | 0.154 | |
| Mean length in mm (±SD) | 23.0 (±8.9) | 22.2 (±7.0) | 1.11 (±1.8) | 0.107 | |
| Radiologist 2 (M.G.) | Mean height in mm (±SD) | 16.1 (±2.3) | 13.7 (±3.0) | −2.22 (±2.1) | 0.013 |
| Mean width in mm (±SD) | 12.8 (±2.3) | 12.1 (±2.8) | −1.56 (±2.8) | 0.138 | |
| Mean length in mm (±SD) | 23.7 (±8.7) | 22.2 (±7.1) | 0.00 (±3.0) | 1.000 | |
Statistics: paired t-test
n number of patients, mm millimetres, SD standard deviation