Elbow Dislocation: An elbow dislocation occurs when the bones of the forearm (the radius and ulna) move out of place compared with the bone of the upper arm (the humerus). Symptoms and signs include elbow pain, swelling, and inability to bend the arm. Treatment involves reduction of the elbow under conscious sedation. X-rays will then be taken and the patient's elbow will be put in a splint to keep the elbow bent.