Biportal versus uniportal endoscopic technique in Unilateral Laminectomy for Bilateral Decompression (ULBD) for lumbar spinal stenosis

Unilateral laminotomy for bilateral decompression (ULBD) has been adopted widely to treat lumbar spinal stenosis (LSS). The objective of the study is to investigate clinical and radiological outcomes of the biportal endoscopic ULBD (BE-ULBD) and uniportal endoscopic ULBD (UE-ULBD).