Objective
This study aimed to describe the surgical technique in patients with cervical herniated disc treated with unilateral biportal endoscopic spinal surgery.
Materials and Methods
Working and viewing portals were created in each unilateral paravertebral area at the target disc level. Under exploring by endoscopic view, effective decompression was possible via safe access to the medial foramen with minimal laminectomy and facetectomy. We evaluated 27 patients, and clinical outcome was analyzed using the visual analogue scale (VAS), Neck disability index (NDI), Macnab criteria, and motor function of involved upper extremity, all assessed before and 3, 6 months post procedure.
Results
The VASs for axial neck pain and upper extremity pain decreased from 6.8 to 1.9 and 7.7 to 1.5, respectively, at 6 months post procedure. The NDIs were improved from 45.5 to 13.0 at 6 months post procedure. According to the Macnab criteria, an ‘Excellent’ , ‘Good’ , and ‘Fair’ result was obtained in 55.6%, 29.6%, and 14.8% subjects, respectively. The motor power of involved upper extremity improved as an approximately one grade on average at 6 months post procedure; 3.9±0.8 to 4.8±0.4.
Conclusions
Unilateral biportal endoscopic spinal cervical surgery can be an efficient and safe intervention in patients with cervical herniated disc.

Purpose
of Study: Purpose of this study is to summarize the technique of UBE surgery in lumbar interbody fusion and review the clinical outcomes and complications of UBE surgery in lumbar interbody fusion.
Materials and Methods
Medical databases were searched for the key words of unilateral biportal endoscopic surgery and lumbar spinal stenosis using PubMed from 2005 to the present.
Conclusion
UBE spinal surgery is a new technique that can be a feasible alternative and an effective treatment modality for spinal degenerative diseases and can achieve the necessary surgical skills for experienced microscopic surgeons, which is still expanding the indications for lumbar spinal surgery.

Objectives
We report the new minimally invasive technique and its clinical results of oblique lumbar interbody fusion (OLIF) combined with central decompression using biportal endoscopic spinal surgery (BESS). Summary of Literature Review: The OLIF procedure is one of the minimally invasive spine surgeries and is being frequently attempted recently to treat lumbar degenerative disease. It has been reported that it effectively decompresses foraminal stenotic lesions indirectly by inserting a large cage anteriorly, which reduces spondylolisthesis and widens the disc space. However, OLIF has limited effect for severe central canal stenosis, since it cannot achieve direct decompression. Therefore, authors report a new minimally invasive technique of OLIF combined with direct central decompression using BESS for severe central stenosis along with its clinical results as a pilot study.
Materials and Methods
For patients who were candidate for fusion surgery due to spondylolisthesis (more than one segment) or foraminal stenosis, authors performed OLIF and central decompression using BESS simultaneously, when the patients had concomitant severe central canal stenosis. From June to December, 2017, 8 patients (16 levels) were enrolled, the operative time, blood loss, complications and clinical results have been evaluated. The clinical results were analyzed by Visual analog scale (VAS) scores, Oswestry disability index (ODI) and Roland Morris Disability Questionnaire (RMDQ) of preoperative, 1month, 3month postoperative and final follow-up.
Results
Mean operative time and blood loss were 238.4 minutes and 173.3ml, respectively. In all cases, there were no operative complications, and mean follow-up period was 7.1 months. The mean back VAS, lower extremity VAS, ODI, and RMDQ at the final follow-up were improved from 5.4±2.4 to 2.0±0.9, 7.0±1.1 to 1.6±1.7, 64.2±11.8 to 44.2±10.6, and from 17.5±4.2 to 12.9±4.0.
Conclusion
A new combination technique of OLIF and BESS for direct decompression can be regarded as effective alternative procedure to treat the foraminal and central stenotic lesions of lumbar degenerative disease.