The pelvis is made up of two hip bones located and fused on either side of the sacrum, the last section of the backbone. Each hip bone is comprised of three bones fused together – the ilium, ischium and pubis. The sacroiliac joints are the two joints present in your lower back where the sacrum and ilium join. These joints may become painful and inflamed due to various conditions.
A sacroiliac joint injection is a mixture of an anesthetic which blocks pain impulses and a steroid which reduces inflammation and is a conservative treatment to relieve these symptoms.