[Effect and complication among different kinds of spinal endoscopic surgery for lumbar disc herniation].

Objective: To compare clinical efficacy and complication rate of percutaneous endoscopic transforaminal discectomy(PETD),percutaneous endoscopic interlaminar discectomy (PEID) and unilateral biportal endoscopic (UBE) in treating single-segment lumbar disc herniation(LDH).

Methods: From October 2019 to August 2021,121 LDH patients with single-segment treated by spinal endoscopy were retrospectively analyzed and divided into three groups. In PETD group,there were 48 patients,including 19 males and 29 females,aged from 18 to 72 years old with an average of (44.0±13.9) years old;3 patients with L segments,27 patients with L segments,and 18 patients with LS segments. In PEID group,there were 43 patients,including 23 males and 20 females,aged from 20 to 69 years old with an average of (40.1±12.1) years old;1 patient with L segments,15 patients with L segments,and 27 patients with LS segments. In UBE group,there were 30 patients,including 12 males and 18 females,aged from 29 to 72 years old with an average of (41.2±15.0) years old;1 patient with L segments,18 patients with L segments,and 11 patients with LS segments. Operation time,blood loss,fluoroscopy times and complications among three groups were observed and compared. Before opertaion,3 months after operation and at the latest follow-up,visual analogue scale (VAS) was used to evaluate low back pain and lower extremity pain,Oswestry disfunction index (ODI) was used to evaluate lumbar function,and modified MacNab was used to evaluate clinical efficacy at the latest follow-up.

Results: All patients were performed endoscopic spinal surgery completly and were followed up for at least 12 months. One patient occurred dural sac rupture both in PETD and PEID group,and dural sac rupture was small,and there was no obvious discomfort after operation. Two patients were occurred intraoperative rupture of dural sac in UBE group. One patient was occurred cerebrospinal fluid leakage after operation,and was improved after rest in supine position and fluid rehydration. One patient without no significant postoperative discomfort. (1)There were no significant difference in operating time,blood loss and hospital stay between PETD and PEID group (>0.05),while UBE group was higher than those of PETD and PEID group (<0.05). There was no statistical significance in fluoroscopy times between PEID and UBE group (>0.05),but PETD group was higher than that of PEID and UBE group (<0.05). (2)VAS of low back pain at 3 months after operation in UBE group was higher than that in PETD and PEID group (<0.05),but there was no significant difference between PETD and PEID group (>0.05). At the latest follow-up,there was no significant difference in VAS of low back pain among three groups (>0.05). (3)Lower extremity pain of VAS and ODI among 3 groups after operation were significantly improved at all time points compared with those before opertaion(<0.05),and there were no statistical significance between groups (>0.05),and there were no statistical significance in interaction between different time points and operation groups (>0.05). (4) At the latest follow-up,according to the modified MacNab standard,the results of PETD group were excellent in 27 patients,good in 16 patients,moderate in 4 patients,poor in 1 patient;in PEID group,27 patients got excellent result,12 good,3 moderate,and 1 poor;in UBE group,16 patients got excellent,10 good,2 moderate,and 2 poor. There was no significant difference among three groups (=0.308,>0.05). Recurrence of lumbar disc herniation occurred in 1 patient among each three groups,symptoms were improved in 2 patients after symptomatic treatment,and 1 patient was treated in other hospitals.

Conclusion: PETD,PEID and UBE techniques could achieve good early clinical effects in treating lumbar disc herniation with similar complication rates. Both of PETD and PEID are single-channel minimally invasive surgery,with mild intraoperative tissue damage and quick postoperative recovery; while intraoperative fluoroscopy of PETD was relatively more frequent, and PEID was more suitable for LS segment;UBE is a two-channel surgery,in which the intraoperative soft tissue damage is more severe,but exposure is broad,which is more suitable for complex cases.