Inclusion Criteria:  Patients aged 18 to 85 years  Patients with a new or known diagnosis of lumbar spinal stenosis on Magnetic Resonance Imaging (MRI)  Patients scheduled to undergo TFESI due to low back pain or leg pain  Exclusion Criteria:  Refusal of a patient  Coagulopathy  Systemic infection or local infection at the needle injection site  Patients with lumbar instability  Neoplasms in the needle path  Allergy to amide-type local anesthetics  Decreased cognition to the extent that NRS is incomprehensible  Patients with peripheral vascular disease (including peripheral arterial disease)  Patients taking anticoagulant or antiplatelet drugs  Patients with severe cardiovascular disease or liver or kidney disease  Patinets with cerebral infarction  Patinets with a history of gastrointestinal bleeding  Patinets who have had lumbar spine surgery or are expected to receive it within 12 months  Patients who show positive in the straight leg elevation test  Patients who are allergic or sensitive to limaprost (Opalmon®) and placebo or their ingredients