Although unilateral biportal endoscopy (UBE) has proven effective as a minimally invasive decompressive laminectomy for lumbar spinal stenosis, the learning curve for surgeons new to endoscopic techniques remains a significant barrier. This study aimed to quantify this learning curve and identify strategies to expedite proficiency, focusing on reducing operative times and complications. The cumulative summation test was used to evaluate the learning curves for both surgical methods.