Left Superior Innominate Shear
The illiosacral dysfunctions are dysfunctions of the innominate on one side of the sacrum. They're dependent upon the ligamentous integrity. The mechanism of injury for this is the classic pratfall, when the patient slips and falls or some force is applied to one innominate and it drives the innominate cephalward in relationship to the sacrum on that side and it gets restricted there.
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Click here to view a summary of iliosacral joint dislocation.