what is medial branch block
A medial branch nerve block is a type of injection used to determine if the facet joint is causing the patient's back pain.Facet joints are pairs of small joints between the vertebrae in the back of the spine.edial Branch Block Video. Medial branch nerves are small nerves that feed out from the facet joints in the spine, and therefore carry pain signals from those joints. A medial branch nerve block temporarily interrupts the pain signal being carried from a specific facet joint.