Chapter 2 – SI Joint Anatomy, Biomechanics & Prevalance.mp4
Posted on Aug 11, 2011 under sacroiliac joint pain | No CommentThe SI Joint is the connection among the spine and the pelvis. The SI Joint is a accurate diarthrodial joint. The articular surfaces are ear shaped, containing irregular ridges and depressions. Its concave sacral surface is covered with thick hyaline cartilage and its convex iliac surface lined with thin fibrocartilage. Biomechanically, the SI Joint’s movement is induced by motion occurring at other locations in the body. This movement is quite modest, with much less than four degrees of rotation and much less than 1.6 mm of translation. Whilst the SI Joint is vulnerable to shear in the course of rotation or translation, compression of the joint enables it to resist shear. Those structures that create joint compression contain the interosseous ligaments and the joint capsule which includes strong posterior ligaments protecting the network of adjacent nerves. The muscles that assist stabilize the SI Joint contain the piriformis, the psoas, the illiacus, the glutes, and the hamstrings. The hamstring muscles do not cross the SI Joint but may possibly be related with SI Joint dysfunction.
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