EuroPainClinicsStudy XIr-Zj

Determine the efficacy of lumbar medial branch neurotomy by radiofrequency and cryoablation in patients with chronic low back pain

Inclusion Criteria: * patients aged between 20 and 80 * positive two medial branch nerve blocks with pain relief over 80% during the first 12 hours after nerve block application * positive patient history of facet joint pain * patients with chronic low back pain for at least 6 months with back pain and leg pain (VAS \>=5) * 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: * patients with a history of other spinal diseases (compression fracture, spondylitis, tumor) * women with positive a pregnancy tests before the trial or who planned to become * pregnant within the following 3 years * other patients viewed as inappropriate by the staff * disagreement with participation in the study