The sacroiliac joints (SI joints) are two joints located where the pelvis attaches to the bottom of the spine, or sacrum
Sacroiliac Joints are joints in the classic sense but do not have much motion. They provide stabilization of the pelvis for walking. When these joints become inflamed from either disease (ankylosing spondylitis) or from wear and tear (leg-length discrepancy or walking with a limp) a sacroiliac joint steroid injection may be helpful in both diagnosis and treatment of the painful condition. The steroid injection may provide relief for several weeks to several months. If the pain returns the procedure can be repeated.