The medial collateral ligament originates from the anterior inferior surface of the medial epicondyle and joins the ulna to the humerus, providing support and resistance in valgus overloads. This ligament is divided into an anterior band, which is stressed during elbow extension a posterior band, which is stressed during elbow flexion and a transverse band, which joins the anterior and posterior bands[2].
The radial collateral ligament of the elbow joint extends from the lateral epicondyle of the humerus to the proximal end of the supinator crest of the ulna. It blends laterally with the annular ligament of the radius. The radial collateral ligament is a fan-shaped ligament composed of a large bundle of fibers.
The annular ligament encircles the head of the radius, holding it in the proximal radioulnar joint, while allowing both pronation and supination of the forearm.
