The acromioclavicular joint (AC joint) is where the collarbone (clavicle) meets the highest point of the shoulder blade (acromion). The joint is held together by three strong ligaments and possesses cartilage that covers the ends of both bones.

The upper end of the biceps muscle has two tendons that attach it to bones in the shoulder. The long head attaches to the top of the shoulder socket (glenoid). The short head attaches to a bump on the shoulder blade called the coracoid process. Through a traumatic injury or overuse, the biceps tendon can tear or become inflamed.

A clavicle fracture is also known as a broken collarbone. A fairly common injury, most fractures occur when a fall onto the shoulder or an outstretched arm puts enough pressure on the bone that it snaps or breaks. This can happen in sports like football, lacrosse, hockey, biking, skateboarding, and skiing. It is also a very common bike injury.

Your shoulder is a ball-and-socket joint made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle). The head of the upper arm bone fits into a shallow socket in your shoulder blade. Strong connective tissue, called the shoulder capsule, surrounds the joint.

The shoulder labrum is a piece of soft cartilage in the socket-shaped joint in your shoulder bone. It essentially deepens the socket, creating a suction seal of the joint and connects the two joints. A group of four muscles called the rotator cuff helps the labrum keep the ball in the socket. This allows your upper arm to rotate. Repetitive motion and injuries can tear the labrum, often causing pain.

Your shoulder is made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle). The shoulder is a ball-and-socket joint: the ball, or head, of your upper arm bone fits into a shallow socket in your shoulder blade. Your arm is kept in your shoulder socket by your rotator cuff. The rotator cuff is a group of four muscles that come together as tendons to form a covering around the head of the...

The shoulder joint is the body's most mobile joint. It can turn in many directions. But, this advantage also makes the shoulder an easy joint to dislocate. A partial dislocation (subluxation) means the head of the upper arm bone (humerus) is partially out of the socket (glenoid). A complete dislocation means it is all the way out of the socket.

One of the most common physical complaints is shoulder pain. Your shoulder is made up of several joints combined with tendons and muscles that allow a great range of motion in your arm. Because so many different structures make up the shoulder, it is vulnerable to many different problems.