A radiofrequency Neurotomy/Rhizotomy is a treatment used to reduce pain from facet joints or the sacroiliac joint. Radiofrequency energy is used (either hot or cold) to partially destroy the nerves going to the facet or sacroiliac joints to reduce pain. This procedure requires an IV and is done on an X-ray table. After numbing the skin, fluoroscopy (real time X-ray) is used to guide a radiofrequency probe onto the nerves that supply the facet or sacroiliac joint. Radiofrequency waves are then used to create a lesion along the nerve pathway. The goal of a radiofrequency Neurotomy/Rhizotomy is to interrupt the pain signal to the brain, while preserving other functions, such as normal sensation and muscle strength. This procedure is done on an out-patient basis.