Clinical outcomes—modified MacNab criteria.
| Outcome Measure | N (%) | P | ||
| Total | Group A | Group B | ||
| Preoperative | 0.079 | |||
| Fair | 20 (41.67) | 7 (29.17) | 13 (54.17) | |
| Poor | 28 (58.33) | 17 (70.83) | 11 (45.83) | |
| 6 mo | 0.1575 | |||
| Excellent | 18 (37.50) | 6 (25.00) | 12 (50.00) | |
| Fair | 5 (10.42) | 4 (16.67) | 1 (4.17) | |
| Good | 25 (52.08) | 14 (58.33) | 11 (45.83) | |
Abbreviation: BESS, biportal endoscopic spine surgery.
Note: Group A underwent conventional BESS technique. Group B underwent both-facet joint–preserving BESS technique. P < 0.05 was considered a statistically significant difference.