![]() Some people have a curve or hook to the underside of the acromion near the rotator cuff tendons. Lying under the acromion, there is a layer of bursa tissue and some of the rotator cuff. However, most frequently it does not cause a a problem. Occasionally the os acromiale can cause discomfort. In some people there is an extra piece of bone that, during development, did not fuse to the rest of the acromion. This bone also gives the shoulder much of its almost squared-off shape. Much of the strong deltoid muscle around the shoulder attaches to the acromion. The acromion is a fairly flat projection of the scapula that curves around from the back to the front of the shoulder. ![]() Clavicle fractures typically happen after a fall or other significant trauma. ![]() There are two ends with joints on the clavicle, and these can become arthritic in some people. The clavicle attaches to several muscles connecting it to the arm, the chest and the neck. In most people, the clavicle is easy to feel and even see under the skin. The clavicle, or “collar bone,” is a long slightly curved bone that connects the arm to the chest. ![]() Injuries to the scapula are usually from an awkward fall or car accident. The shoulder girdle combines to give you shoulder motion. Because of this, the main shoulder joint (called the glenohumeral joint), the scapula, and the surrounding muscle and ligament are collectively referred to as the shoulder girdle. ![]() Much of the motion of the shoulder is actually motion between the scapula and the chest. The acromion is the part of the scapula that attaches to the collar bone and is the only true joint attaching the arm to the body. The scapula has a joint that wraps around from the back to the front of the shoulder called the acromion. In fact, there are 17 muscles that attach to the scapula. It, essentially, floats off of the back of the chest, as it is connected to the body primarily by muscle. The scapula, or “shoulder blade,” is an approximately triangular shaped bone. The bones have a crystalline construction embedded with mineral and live cells that maintain and repair the skeleton. Bones have many shapes and sizes and are important to add structure to the body and protection to the vital structures. ![]()
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