Sergio Marcucci
The sacroiliac joint (SIJ) is organized by articular surfaces between the sacral and iliac bones. The SIJ includes different functions, among which to connect the spine to the pelvic bone, which permits for better transmission of vertical forces from the spine to the pelvis and lower extremities. The first purpose of the SIJ is to provide stability, which is promoted partly by the muscles attached to the SIJ and is provided by multiple mechanisms, embracing the complex of ligaments fixed to the SIJ.