Background: Repeated open discectomy has been the most common surgical procedure for recurrent lumbar disc herniation. There were no published reports on the BPED for recurrent disc herniation.

Objective: To evaluate the efficacy and surgical outcome of BPED for recurrent lumbar disc herniation.

Material and Method: A study of 27 consecutive patients who underwent biportal percutaneous endoscopic discectomy (BPED) for recurrent lumbar disc herniation. The inclusion criteria were recurrent disc herniation at the same level, regardless of side, with a pain-free interval longer than 6 months after the conventional discectomy. BPED were performed under general anesthesia.

Results: The mean follow-up period was 26 months (24 to 32 months). Based on the modified MacNab criteria, 81.4% showed excellent or good outcomes. The mean visual analog scale decreased from 8.2±1.2 to 2.3±2.0 (p<0.05).

Conclusion: BPED was an effective surgical procedure for recurrent lumbar disc herniation. The endoscopic approach through scarred tissue did not increase nerve injury and show complications.

Keywords: Endoscope, Biportal, Two portal, Discectomy, Percutaneous, Revision, Recurrent herniated nucleus pulposus