If you have a pinching and sharp pain in your shoulder or shoulders while swimming, you may be suffering from swimmer's shoulder. This condition may limit your ability to swim and use your arm normally for functional tasks.
The acromioclavicular joint, abbreviated as the AC joint, is the junction of the end of the collarbone (clavicle) with the side of the shoulder blade (called the acromion). The AC joint can be damaged much like other joints and may require treatment.
A shoulder separation is an injury to the acromioclavicular joint on the top of the shoulder. The shoulder joint is formed at the junction of three bones: the collarbone (clavicle), the shoulder blade (scapula), and the arm bone (humerus). A shoulder separation occurs where the clavicle and the scapula come together.