Review of chronic low back pain of facet joint origin.

Chronic low back pain secondary to involvement of the facet joints is a common problem. Facet joints have been recognized as potential sources of back pain since 1911. Multiple authors have described distributions of pain patterns of facet joint pain. The facet joints are paired diarthrodial articulations between the posterior elements of the adjacent vertebrae. Lumbar facet joints are innervated by medial branches of the dorsal rami of the spinal nerves from the L1 to L4 levels. At L5, the dorsal ramus travels between the ala of the sacrum and its superior articular process and divides into medial and lateral branches at the caudal edge of the process. Each segmental medial branch of the dorsal ramus supplies at least two facet joints. The existence of lumbar facet joint pain claims has a preponderance of evidence, even though there are a few detractors. Multiple studies utilizing controlled diagnostic blocks have established the prevalence of lumbar facet joint involvement in patients with chronic low back pain, as ranging from 15% to 52%, based on type of population and setting studied. Long-term therapeutic benefit has been reported from three types of interventions in managing lumbar facet joint pain, including intraarticular injections, medial branch blocks and neurolysis of medial branches. This review will discuss chronic low back of facet joint origin and covers anatomy, pathophysiology, diagnosis, and various aspects related to treatment, including clinical effectiveness, cost effectiveness, technical aspects and complications.