1. 2013;16;359-367Comparative Assessment of Different Percutaneous Endoscopic Interlaminar Lumbar Discectomy (PEID) Techniques
   Retrospective Evaluation
   Hyeun Sung Kim, MD, PhD, and Jeong Yoon Park, MD, PhD.

BACKGROUND: Percutaneous endoscopic lumbar discectomy is a common surgical treatment for lumbar disc herniation, and percutaneous endoscopic interlaminar lumbar discectomy (PEID) is commonly used for direct decompression of L5-S1. Like microdiscectomy, recurrence of herniation after endoscopic discectomy is an important problem. In this study, we aimed to decrease the recurrence after PEID using a new surgical technique.

OBJECTIVES: We propose a new surgical technique for reducing the recurrence after PEID for lumbar disc herniation. The new technique uses annular sealing after fragmentectomy. We compared clinical results and recurrent lumbar disc herniation (had radiculopathy and confirmed by MRI) between patients who underwent surgery with and without annular sealing during PEID.

STUDY DESIGN: Retrospective cohort study of patients undergoing PEID.

METHODS: A total of 224 patients with radiculopathy due to L5-S1 disc herniation who were treated by PEID with (91 patients) or without annular sealing (133) were included in this study. We compared the demographic characteristics (age, sex, height, weight, BMI, smoking status, and occupation), clinical results, and recurrence rates between the 2 groups. We classified recurrence according to time period (early recurrence ≤ 6 months, late recurrence > 6 months).

RESULTS: The study groups were demographically similar, and substantial improvement in clinical results was noted. There were 5 recurrences (5.5%) (2 early, 3 late recurrences) in the group with annular sealing, and 18 (13.5%) (13 early, 5 late recurrences) in the group without annular sealing. Early recurrence rates were significantly higher in the group without sealing (2 vs. 13, P = 0.029). Increasing age was associated with overall recurrence (P = 0.004) and late recurrence (P = 0.008), while operative technique correlated with early recurrence (P = 0.026).

LIMITATIONS: First, this study incorporates a retrospective design. Second, the operations were performed by 2 surgeons. Additionally, this is relatively a short-term follow-up study (mean 19.5 ± 5.0 months).

CONCLUSIONS: Though a learning curve is needed in order to become familiar with PEID, recurrence after PEID was associated with advanced age, and PEID with annular sealing resulted in lower early recurrence rates than without annular sealing. Thus, PEID with annular sealing may be a useful technique for reducing early recurrence.