The Sacroiliac Joint is located at the base of the spine between the illium and sacrum of the pelvis. This joint acts as a shock absorber, transfering weight from the upper body to the legs. Inflammation, joint degeneration and trauma can all damage the sacroiliac joint, resulting in pain to the legs, lower back, groin and buttocks. While not every individual is a candidate for surgery, there are many instances in which a sacroiliac joint fusion can help alleviate pain and restore mobility to the patient. Neurosurgical Associates of San Antonio Drs. Robert Johnson and Donald Atkins perform this surgery at the Methodist Hospital.