Biportal Endoscopy Spine Surgery (BESS )Versus Unilateral Laminotomy Bilateral Decompression (ULBD ): RCT, Non-inferiority Trial

Outcomes Following Bilateral Decompression Surgery in Lumbar Spinal Stenosis With Biportal Endoscopy Versus Unilateral Laminotomy Technique: A Prospective, Single-blinded, Randomized Controlled Non-inferiority Trial

This study is to compare the clinical outcome between the biportal endoscopic decompression and the unilateral approach bilateral decompression in spinal stenosis

Inclusion Criteria:

• patients aged between 30 and 80
• patients who has radiating pain (VAS >=40) on lower extremities with spinal stenosis over Gr B
• patients who required one-level decompression between L1 and S1
• those who (only if a signature was obtainable), or whose legal guardian, fully understood the clinical trial details and signed the informed consent form

Exclusion Criteria:

• Revision surgery
• Over spondylolisthesis Gr II
• Degenerative lumbar scoliosis (Cobb angle >20)
• herniated disc
• patients with a history of other spinal diseases (compression fracture, spondylitis, tumor)
• women with positive pregnancy tests before the trial or who planned to become pregnant within the following 3 years
• patients with a history of malignant tumor or malignant diseases (but the cases of cured disease with no relapse for the past 5 years were included in the present study)
• patients with mental retardation or whose parents or legal guardians were older or had mental disabilities
• other patients viewed as inappropriate by the staff