A Sacroiliac Joint Posterior Ligaments Biomechanics and Clinical Implication for the Clinician

The sacroiliac joint (SIJ) is structured by articular surfaces between the sacral and the iliac bones. The SIJ embraces different functions because it connects the spine with the pelvis, which permits the soaking up of vertical forces from the spine and, thus, transferring vertical forces to the pelvis and lower extremities. The first goal of the SIJ is to preserve stability that is partly done by the muscles surrounding the SIJ and realized by various procedures, encompassing a large complex of ligaments connected to the SIJ. The range of motion of the SIJ is evaluated to be around 2 to 4 degrees. 35 muscles attached to the sacrum bone or innominate work together in synergy with the fascia and ligaments to move and ensure the stability of the trunk and lower extremities. The SIJ is an essential source of pelvic and low back pain (LBP), which should be considered in the differential diagnosis of pelvic and LBP.

Author(s):  Dr. Sergio Marcucci

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