Table 2.
Incidence of PSEH after BESS by grading system and the incidence of revision surgery caused by PSEH. (PSEH: postoperative spinal epidural hematoma, BESS: biportal endoscopic spine surgery).
| Total patients n = 206 |
Group A n = 117 (56.8%) |
Group B n = 89 (43.2%) |
|
|---|---|---|---|
| Non-PSEH (Grade 0) | 169 patients (79.1%) | 86 patients (73.5%) | 77 patients (86.5%) |
| PSEH (Grades I~IV) | 43 patients (21.9%) | ||
| Grade I (canal encroachment 0~25%) | 19 patients (9.2%) | 10 patients (8.5%) | 9 patients (10.1%) |
| Grade II (canal encroachment 50~75%) | 19 patients (9.2%) | 16 patients (13.7%) | 3 patients (3.4%) |
| Grade III (canal encroachment 50~75%) | 5 patients (2.4%) | 5 patients (4.3%) | 0 patients (0.0%) |
| Grade IV (canal encroachment 50~75%) | 0 patients (0%) | 0 patients (0%) | 0 patients (0.0%) |
| Revision due to PSEH | 2 patients (0.9%) | 2 patients (1.7%) | 0 patients (0.0%) |