As the most posterior projection of the iliac crest, it serves for the attachment of the long posterior sacroiliac ligament
, which blends with the sacrotuberous ligament, as well as the multifidus and gluteus maximus muscles.
Lateral branches of dorsal sacral nerve plexus and the long posterior sacroiliac ligament
Additionally, the MRI revealed a disruption of the anterior sacroiliac ligaments on the left side and no affection of the posterior sacroiliac ligaments, the sacrotuberal and sacrospinal ligaments (Figures 1(c) and 1(d)).
c) Axial MRI revealed ruptured left anterior sacroiliac ligaments and intact posterior sacroiliac ligaments (arrows).
The long and short posterior sacroiliac ligaments
, the interosseous ligaments within the sacroiliac joints and the sacrotuberous ligaments all resist forces leading to vertical translation between the ilia and the sacrum.
Additional posterior support is provided by the anterior and posterior sacroiliac ligaments
, along with the iliolumbar ligaments, which connect the transverse processes of the L5 vertebral body to the iliac crest.
the area forming the synovial joint) and the unique morphologic features created by the anterior and posterior sacroiliac ligaments
, but chiefly by the stout interosseous ligaments, stabilize the joint by strictly limiting planar (gliding) movement [36,38].