Comparison of Endoscopic Lumbar Decompression and Minimally Invasive Transforaminal Lumbar Interbody Fusion(MIS-TLIF) for Degenerative Lumbar Spondylolisthesis

Inclusion Criteria: * Single level lumbar degenerative spondylolisthesis (Meyerding Grading Grade I or II). * Failed conservative treatment for at least 3 months. * No instability evidence of levels of lesion (Consideration from translation more than 5 mm or angulation change more than 10 degree in flexion and extension L-S plain films ). * Able to follow up for at least 12 months. * Patient who vorantarily agree to participate in research. Exclusion Criteria: * Patients with severe foraminal stenosis diagnosed by MRI. * Patients who have previously undergone lumbar spine surgery (revision surgery). * Patients with other abnormalities in the lumbar spine, such as infection, tumors, or fractures. * Patients who cannot undergo surgery due to underlying conditions or who cannot maintain the prone position for extended periods.