Comparing the functional and radiographic outcomes in surgical treatment in failed conservative treatment, single-level low grade degenerative lumbar spondylolisthesis between Minimal Invasive Surgery Transforaminal Lumbar Interbody Fusion, which is conventional treatment recently, and Endoscopic Lumbar Decompression, which is minimal invasive in symptomatic treatment.
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.
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.