Table 6.
The changes in central canal stenosis.
| STL | FEL | P-value | |||
|---|---|---|---|---|---|
| Preoperative | Postoperative | Preoperative | Postoperative | ||
| B a | 4 (19%) | 11 (55%) | 3 (13%) | 12 (55%) | |
| C a | 13 (62%) | 0 | 17 (72%) | 2 (9%) | |
| D a | 4 (19%) | 0 | 3 (13%) | 0 | |
| CSA (mm2) | 58.5 ± 21.6 | 119.0 ± 28.8 | 60.4 ± 22.5 | 102.8 ± 35.1 | < .005 b |
| CSA expansion rate (%) | 234.7 ± 116.4 | 183.6 ± 14.7 | .110‡ | ||
aThe degree of central canal stenosis was evaluated based on Schizas grade.
bWilcoxon signed rank test was used to confirm the CSA expansion effect of two surgeries.
Mann–Whitney U test was used for comparing changes between the two groups.
Abbreviations: STL, subtotal laminectomy; FEL, full-endoscopic laminotomy; CSA, cross-sectional area.