A sacroiliac joint injection (SI) - also called a sacroiliac joint block - is used to either diagnose or treat low back pain and/or sciatica symptoms.
The sacroiliac joint is located next to the spine and connects the sacrum with the hip on both sides. Joint inflammation and/or dysfunction in this area can cause pain.
During the procedure, the skin is numbed with anesthetic. Then, using a fluoroscope, an X-ray is used to guide a small needle into the joint. A small mixture of numbing medication (anesthetic) and anti-inflammatory medication are then injected.
This 20-30 minute procedure is very effective in reducing inflammation of the joint and providing substantial to complete pain relief for an extended period of time.