Lumbar Facet–Mediated Pain

Abstract

Lumbar or lower back pain is a very debilitating condition that affects almost one fifth of the adult population during a given year. Almost everyone walking on two feet is bound to suffer from some back pain during their lifetime. The health care burden for treating low back pain is enormous, especially if the lost work hours are combined with the amount used in diagnosing and treating low back pain. Lumbar facet (zygapophysial) joints are one of the major components involved in causing lower back pain. Diagnosing the pain generator is more of an art than a science. Combining various parameters in the patient’s history, physical examination, and diagnostic studies is not much different from solving a murder mystery. Although facet joint pain may be accompanied by other pain generators, that is, lumbar intervertebral disks, nerve roots, and vertebral bodies, once treated, the relief in pain is more helpful in performing proper rehabilitation and improving further deterioration in low back pain. Muscles are almost always painful due to myofascial pain syndrome that accompanies the facet joint–related pain. Treating one without addressing the other leads to failure in management and optimization of patient’s pain and function. Several treatments are available for treatment of facet joint–mediated pain, including steroid injections using a miniscule amount and radiofrequency ablation of the nerves supplying the facet joints (medial branches of the dorsal primary ramus of the lumbar nerve root). With proper diagnosis and treatment, a patient’s pain and function can be optimized to a level where it may not impact the day-to-day activities or even resumption of the patient’s routine job function. The following review describes the anatomy, pathophysiology, diagnosis, and treatment of lumbar facet joint–mediated pain. Key words: facet joint pain, facet joint syndrome, low back pain, medial branch radiofrequency, spondylolisthesis