The facet joints are joints between two adjacent vertebras. They are responsible for the movement of bending forward; back ward and twisting. Because of wear and tear, trauma or mechanical stress on the spine, these joints can become inflamed and cause pain. Facet joint injections or medial branch injections deliver a steroid and anesthetic lidocaine to the joint to block and medicate the area. The lumbar facet joint or medial branch injection can pinpoint the root cause diagnosis of back pain and provide significant pain relief and inflammation.