The Sacroiliac joint dysfunction sij d (SI) Joints are formed by the connection of the sacrum (the sit bone) and the iliac bones (the hip bone). The sacrum is made up of five vertebrae that are fused together and the iliac bones are made up of two large bones that make up the pelvis. This means the SIJ joints connect the spine to the pelvis which is what allows us to walk/ create movement. The sacrum and the iliac bones (ileum) are held in position by a number of strong ligaments. The SIJ’s main function is to provide stability of the entire body therefore it does not offer much movement (about 3-5 degrees) or range of motion. However, it is important that this joint functions properly as any dysfunction can cause pain due to placing a lot of stress on the joint and lead to wearing of the cartilage of the SI joints and arthritis.