![]() ![]() Osteoarthritis: The common "wear-and-tear" arthritis that occurs with aging.As a frozen shoulder progresses, movement in the shoulder can be severely limited. Frozen shoulder: Inflammation develops in the shoulder that causes pain and stiffness. ![]() This gives the shoulder a wide range of motion, but also makes it vulnerable to injury. The humerus fits relatively loosely into the shoulder joint. A cuff of cartilage called the labrum forms a cup for the ball-like head of the humerus to fit into.The bursa is a small sac of fluid that cushions and protects the tendons of the rotator cuff.The rotator cuff is a collection of muscles and tendons that surround the shoulder, giving it support and allowing a wide range of motion.The shoulder has several other important structures: The coracoid process is a hook-like bony projection from the scapula.The clavicle (collarbone) meets the acromion in the acromioclavicular joint.The acromion is a bony projection off the scapula.Other important bones in the shoulder include: The shoulder joint is formed where the humerus (upper arm bone) fits into the scapula (shoulder blade), like a ball and socket. The shoulder is one of the largest and most complex joints in the body. ![]()
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