Dysfunction in the sacroiliac joint, or SI joint, is thought to cause low back and/or leg pain. This pain may mimic that of sciatica or pain caused by a lumbar disc herniation.
While it is not 100% clear what causes sacroiliac pain; it is thought that an alteration in the normal joint motion may be involved
Too much movement (hypermobility or instability): The pain is typically felt in the lower back and/or hip and may radiate into groin area.
Too little movement (hypomobility or fixation): The pain is typically felt on one side of the low back or buttocks, and can radiate down the leg. The pain usually remains above the knee, but at times pain can extend to the ankle or foot.
Sacroiliac Pain and dysfunction is generally more common in young and middle-aged women. Talk with your doctor about the role of sacroiliac joint injections and radio-frequency ablations in your treatment plan.