The shoulder is composed of many connected bones, joints, muscles, and tendons that allow people to carry out a wide range of motions through the arm. The shoulder allows diverse movements such as reaching out, pulling or pushing objects, and throwing things away. Sudden or awkward movements in the shoulder can cause injuries, as can overuse and wear and tear from aging. At Parkview Orthopaedic Group, our fellowship-trained shoulder surgeons are experts in treating a wide variety of these injuries and illnesses.
The upper extremities are connected to the chest from the shoulder, which consists of two main joints. The first is known as the glenohumeral joint, which connects the top of the shoulder blade to the beginning of the arm bone. The second shoulder joint is known as the acromioclavicular joint and it connects the shoulder blade with the collar bone. These joints allow the shoulder to move completely and function normally.
BONES IN THE SHOULDER
There are three main bones that form the shoulder — the humerus (arm bone), the clavicle (collarbone), and the scapula (shoulder blade). The scapula creates a hole for the shoulder joint which is covered by cartilage and is known as the glenoid. The glenohumeral joint is where the shoulder blade connects with the rounded top part of the humerus.
The top of the shoulder has a second joint where another part of the shoulder blade—the acromion—is joined to the collarbone. This is known as the acromioclavicular joint.
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