Sacroiliac Joint Injections and Radiofrequency Neurotomy What Is It?The sacroiliac joint is located between the sacrum (at the base of the spine) and the pelvis. A Sacroiliac Joint Injection helps to diagnose and treat pain in the lower back, buttocks and thighs by confirming that the sacroiliac joint is the source of pain. If necessary, … Continue reading Sacroiliac Joint Injections and Radiofrequency Neurotomy