Sacroiliac joint

The sacroiliac joint (or sacro-iliac joint; latin: articulatio sacroiliaca) is a discontinuous bone junction in the pelvis, located between the sacrum and the ilium.

The two articular surfaces of the sacroiliac joint are the following:

  • auricular surface of the sacrum (latin: facies auricularis ossis sacri);
  • auricular surface of the ilium (latin: facies auricularis ossis ilii).

The sacroiliac joint is covered by a joint capsule and it is strengthened by three short ligaments: the anterior sacroiliac ligament, the posterior sacroiliac ligament, and the interosseous sacroiliac ligament.

The sacroiliac joint is connected by fibers that permit little motion.