Sacroiliac pain is pain that occurs from dysfunction at the sacroiliac joint between the sacrum and the ilium. The sacrum is a wedge shaped set of fused bones at the base of the spine. It supports the spine while accommodating for the nerves of the spine and multiple muscular and ligament attachments. The ilium is the uppermost and largest part of the pelvis. It is located below the waistline and extends around from pelvis. The ilium helps to transfer the weight and forces between the trunk and the lower extremity.
Signs and Symptoms of Sacroiliac dysfunction include:
- Pain in the lower back and posterior pelvis
- Pain referring into the upper thigh and leg
- Hypermobility of one or both sacroiliac joint causing instability
- Hypomobility of one or both sacroiliac joint causing stiffness
- Malalignment of the pelvis (rotation, flaring, upslip etc)
Pain is generally worse when walking and moving about. Pain lessens with sitting.
An evaluation of the sacroiliac joint as well as surrounding joints (lower back, pelvis, hip, knee) is recommended to rule out other conditions that may be masking sacroiliac dysfunction.
American Physical Therapy Association Physical Therapy Guide