The sacroiliac joints are formed by the union between the sacrum and both iliac bones (the bones of the pelvis). There is one on each side of the sacrum, and they are large joints. They have reduced mobility, but can nevertheless suffer from inflammatory, traumatic or degenerative changes and cause pain.
Sacroiliac joint pain is usually located in the buttocks or buttocks (on one or both sides), and radiates to the back of the thigh. Sometimes it can also radiate to the groin or leg and even to the sole of the foot. It may cause pain when the individual is sitting, and may cause nocturnal pain and awaken the patient at night. Sometimes sacroiliac joint involvement can be a symptom of a rheumatic disease that has gone unnoticed.
To correctly diagnose the cause of sacroiliac pain it may be necessary to perform X-rays, an MRI or a bone scan. In some cases it is essential to perform a sacroiliac joint puncture to inject local anesthetics to confirm that the cause of the pain is in the sacroiliac joints.