The shoulder is an amazing joint with incredible flexibility. It doesn’t attach directly to the spine, like the hip joint; instead, it is held to the body through a complicated system of musculature and indirectly by the collarbone (clavicle) to the front of the rib cage. Many other joints in the body are extremely stable, thanks to the structure of the bones and ligaments surrounding them. However, the shoulder has so much movement that some stability is sacrificed. It is for this reason that shoulder dislocations are a relatively common occurrence.