Three bones come together at the elbow to form the elbow joint. The humerus is the bone in the upper arm, forming the upper elbow. The other two bones make up the forearm (the radius and the ulna), or the lower part of the elbow. Ligaments connected to the bones keep all of these bones in proper alignment (Ligaments connect bone to bone). Elbow dislocation occurs with trauma to the elbow, which disrupts the ligament attachments, causing the elbow to dislocate. A complete elbow dislocation is extremely painful and very obvious. The arm will look deformed and may have an odd twist at the elbow. This is considered an emergency injury and the goal of immediate treatment is to return the elbow to its normal alignment. Long-term goal of treatment is to restore function to the arm.