Medial Branch Blocks (MBB)
A Medial Branch Nerve Block or MBB is a diagnostic injection used to confirm that the source of your pain is the facet joint. The medial branch nerve sends a pain signal from the facet joint ( the connection point between two vertibrae in the spine). During this procedure, a needle is placed over this nerve and a local anesthetic is injected (at times with a steroid). The anesthetic works to interrupt the pain signal transmission.
If the source of your pain is indeed coming from the facet , you should experience fairly rapid pain relief after the procedure. If this diagnostic test is successful at relieving your pain, a more long-term treatment option can be employed, such as Radiofrequency Ablation of the nerve.