 Mechanical low back pain is the most common cause of chronic low back pain. Anatomical structures, such as facet joints, sacro-iliac joints, posterior longitudinal ligaments and muscles have been found to generate and contribute to the mechanical low back pain. The lumbar zygapophyseal facet joints are the pain generators in 15 to 45 of patients with chronic low back pain. Variety of interventional treatment modalities have been used to treat facet joint pain. Intraarticular injections of steroids and radiofrequency RF ablation of the nerve supply of the facet joints are the most widely practised. A recent NICE guideline NG 59 has recommended radiofrequency denervation but not steroid injections for proven lumbar facet joint pain. 