From the case:
Sternomanubrial dislocation (diagrams)
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Diagrams of the normal manubriosternal joint and the two types of manubriosternal dislocation.
Case Discussion
Dislocation is classified into two types based on the position of the body of the sternum relative to the manubrium and is representative of the mechanism of injury.
type I injuries are the least common, where the sternal body dislocates posteriorly with respect to the manubrium. It is usually due to direct traumatic anterior compression of the sternal body.
type II injuries are more common, where the sternal body dislocates anteriorly with respect to the manubrium. It is due to either direct trauma to the manubrium or indirect upper thoracic hyperflexion which transfers compressive forces via the first ribs to the manubrium.
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