Exercising the shoulder joint involves not just one, but 3 complex joints, therby increasing the risk of overuse injuries to the shoulder girdle.
* The sternoclavicular joint is the only place that the upper extremity is actually attached to the rest of the skeleton.
* The acromioclavicular (ac joint) joint at the shoulder, joins the scapula with the clavicle.
* The glenohumeral or shoulder joint joins the humerus with the scapula.
The bones of the shoulder girdle are joined
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