The anterior sacroiliac ligaments are thin, flat bands crossing the front of the sacroiliac joint, essentially thickenings of its anterior capsule. They are the weakest part of the SI ligament complex, much less substantial than the interosseous and posterior ligaments, reflecting the predominantly posterior loading of the joint. The lumbosacral trunk and upper sacral nerve roots lie immediately in front of them.
| Origin | Anterior surface of the sacral ala and pelvic surface of the sacrum |
|---|---|
| Insertion | Anterior ilium near the margin of the auricular surface |
| Actions |
|
|---|
Reinforces the anterior capsule of the sacroiliac joint and resists anterior gapping of the joint.
Anterior SI ligament disruption widens the front of the SI joint on AP pelvis radiograph in external rotation (open-book, Tile B1) pelvic injuries, where the symphysis fails first and the posterior ligaments remain intact. A pelvic binder or external fixator closes the pelvis acutely, and definitive symphyseal plating controls the anterior ring, while the posterior ring is stabilised separately if the posterior ligaments are also disrupted. The nerve roots lying on these ligaments are at risk in anterior approaches to the SI joint.
Anterior SI ligament disruption opening the pelvic ring anteriorly managed with anterior plate fixation for significant diastasis.
This website uses cookies to enhance your experience. Some are essential for site functionality, while others help us analyze and improve your usage experience. Please review your options and make your choice.
If you are under 16 years old, please ensure that you have received consent from your parent or guardian for any non-essential cookies.
Your privacy is important to us. You can adjust your cookie settings at any time. For more information about how we use data, please read our privacy policy. You may change your preferences at any time by clicking on the settings button below.
Note that if you choose to disable some types of cookies, it may impact your experience of the site and the services we are able to offer.
Some required resources have been blocked, which can affect third-party services and may cause the site to not function properly.
This website uses cookies to enhance your browsing experience and ensure the site functions properly. By continuing to use this site, you acknowledge and accept our use of cookies.
