That's Not Humerus

Well, actually it is the humerus that sees all the action when one dislocates a shoulder. The shoulder anatomy is based on giving the joint extreme flexibility including very close to a 360 degree arc of motion. To achieve this enhanced level of function, mother nature drew up a ball and socket joint with an extremely shallow socket (the glenoid, which is the joint component of the shoulder blade or scapula). The comparable joint in the lower extremity is the hip which is also a ball and socket joint but with a much deeper socket. The hip doesn't need the same arc of motion for function. The trade off for less motion is much better stability. A shoulder dislocation shouldn't be confused with a "separated shoulder" which is what is medically known as an injury to the A-C (acromio-clavicular) joint between the clavicle (collarbone) and the acromion (the shoulder blade's bony projection that connects it to the clavicle). Given that the shoul...