Table 4.
Comparison of radiologic parameters based on the distribution of cage location before and after surgery.
| Parameters | Cage located at anterior (n=39) | Cage located at middle (n=41) | p-value |
|---|---|---|---|
| FD (mm) | |||
| Preoperative | 1.4 (1.11, 1.69) | 1.27 (1.05, 1.48) | .2859 |
| Postoperative | 1.99 (1.57, 2.34) | 1.69 (1.48, 1.99) | .2956 |
| % Facet distance change | 29.66 (4.89, 81.03) | 30.3 (6.08, 70.91) | .8378 |
| CSA (mm2) | |||
| Preoperative | 105.58±38.63 | 104.84±45.88 | .9455 |
| Postoperative | 118.2 (96.07, 157.68) | 127.76 (94.96, 161.74) | .7262 |
| % CSA improvement | 19.35 (8.28, 35.81) | 22.76 (11.56, 48.56) | .4405 |
| CSF (mm2), Left | |||
| Preoperative | 46.85±14.08 | 40.96±11 | .07 |
| Postoperative | 70.63±18.41 | 70.57±24.67 | >.99 |
| % CSF improvement | 51.6 (24.47, 72.93) | 67.73 (30.7, 130.13) | .1471 |
| FH (mm) | |||
| Preoperative | 16.7±2.41 | 15.86±4.08 | .3396 |
| Postoperative | 18.2±2.46 | 19.57±4.28 | .1374 |
| % FH improvement | 6.64 (0.82, 17.24) | 20.16 (13.28, 38.08) | <.001 |
FD, facet distance (based on axial MR image); CSA, cross-sectional area of spinal canal (based on axial MR image); CSF, cross-sectional area of foramen (based on sagittal MR image); FH, foraminal height (based on sagittal radiographic image).