The Elbow:
The elbow joint is formed by three bones, the humerus, radius, and ulna. Articulations between the trochlea of the humerus with the ulna and the capitulum of the humerus with the head of the radius comprise the joint. The elbow is an example of a hinge joint, or a joint that moves in only one direction.
The Ligaments:
Two ligaments are present in the elbow joint, the ulnar collateral ligament and the radial collateral ligament. These ligaments provide strength and support to the joint as do the surrounding muscles.
The ulnar collateral ligament is a strong fan shaped condensation of the fibrous joint capsule. It is located on the medial side of the joint, extending from the medial epicondyle of the humerus to the proximal portion of the ulna. This ligament prevents excessive abduction of the elbow joint.
The radial collateral ligament is also a strong fan shaped condensation of the fibrous joint capsule. It is located on the lateral side of the joint, extending from the lateral epicondyle of the humerus to the head of the radius. This ligament prevents excessive adduction of the elbow joint.
