Dislocations of the SC joint are usually the result of an injury to the shoulder. Most commonly, the outside/front of the shoulder is struck forcefully, and an anterior SC dislocation occurs. In some cases, a blunt force directly to the front of the chest can cause a posterior SC dislocation.
Periscapular bursitis is a possible cause of upper back pain. The scapula, also called the shoulder blade, is an important bone that shifts its position with the upper body and shoulder movement. The motion of the scapula on the upper back is critical to the normal function of the shoulder and the spine. When movements of the shoulder blade are abnormal, significant inflammation and pain can result.
A biceps tendon injury is a tear or rupture of connective tissue that connects the biceps muscle of the upper arm to bones at either the shoulder (proximal tendon) or elbow (distal tendon). Proximal tears are more common than distal tears and usually are the the result of chronic overuse or an acute injury, such as a direct blow to the shoulder or falling onto an outstretched arm.
A torn or ruptured pectoralis muscle can limit your ability to engage in normal work and recreational activities. It can limit arm use, and may cause significant pain. If you have ruptured or torn your pectoralis major muscle in your chest, you may benefit from physical therapy (PT) to help you recover.