Table 1.
Patient demographics.
| STL | FEL | P-value a | |
|---|---|---|---|
| Number of patients | 21 | 24 | |
| Male/female ratio | 11/10 | 9/15 | |
| Age (years), mean±SD | 66.4 ± 10.1 | 64.3 ± 11.7 | .516 |
| Body mass index (kg/cm2), mean ± SD | 24.1 ± 3.4 | 26.1 ± 3.7 | .072 |
| Mean follow up period (months) | 21.2 ± 16.0 | 18.6 ± 11.8 | .845 |
| Operation level, N (%) | |||
| L3-4 | 0 | 4 (18%) | |
| L4-5 | 19 (95%) | 16 (73%) | |
| L5-S1 | 1 (5%) | 2 (9%) | |
| Charlson Comorbidity Index (CCI) | 1.1 ± 1.1 | 1.1 ± 1.5 | .549 |
| Preoperative VAS for back pain | 5.0 ± 2.7 | 5.3 ± 2.4 | .630 |
| Preoperative VAS for leg pain | 6.7 ± 1.7 | 7.3 ± 1.7 | .285 |
| Preoperative ODI | 42.6 ± 22.0 | 52.9 ± 16.3 | .185 |
| Preoperative lumbar lordosis (º) | 49.5 ± 10.0 | 44.0 ± 9.4 | .023 |
| Preoperative segmental lordosis (º) | 18.6 ± 4.5 | 15.8 ± 4.8 | .046 |
| Preoperative CSA (mm2) | 58.5 ± 21.6 | 60.4 ± 22.5 | .880 |
| b Preoperative central stenosis grade, N (%) | |||
| Grade B | 4 (19%) | 3 (13%) | |
| Grade C | 13 (62%) | 17 (71%) | |
| Grade D | 4 (19%) | 3 (13%) | |
aAll statistical analyses were performed by Mann– Whitney U-test.
bPreoperative central stenosis grading was classified based on Schizas grade.
Abbreviations: STL, subtotal laminectomy; FEL, full-endoscopic laminotomy; VAS, visual analogue scale; ODI, Oswestry Disability Index; CSA, cross-sectional area.