Corticosteroid Injections into Lumbar Facet Joints: A Prospective, Randomized, Double-Blind Placebo-Controlled Trial.

Corticosteroid injections into the intra-articular (IA) zygapophysial (z-joints) are frequently utilized to treat this cause of low back pain. No studies have been done on the efficacy of IA corticosteroids in those with z-joint pain confirmed by dual comparative medial branch blocks (MBB).