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The elbow, in essence, is a joint of three major bones supported by ligaments. Connected to the bones by tendons, muscles move those bones in several ways.
The bones that create the elbow are:
- Humerus: This bone extends from the shoulder socket and joins the radius and ulna to form the elbow.
- Radius: This forearm bone runs from the elbow to the thumb side of the wrist.
- Ulna: This forearm bone runs from the elbow to the “pinkie” side of the wrist.
The elbow can move in three ways based on slight variations in the positions of the heads of the three bones. The first is the large hinge action that is used in most movements of the arms, such as holding bags of groceries or doing bicep curls. The other movements are so small that the untrained eye rarely notices the changes in position. These movements help rotate the hand.
The elbow bones are held together primarily by fibrous tissue known as ligaments. Theulnar collateral ligament, or UCL, on the inner side of the joint closest to the body is the primary stabilizer. This thick triangle-shaped band connects the head of the humerus to the heads of the ulna and radius.
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