The elbow consists of three bones i.e. the humerus (the upper arm bone), the radius (forearm bone on the pinky finger side) and the ulna (forearm bone on the thumb side. The three bones are connected with a hinge joint, which is covered with articular cartilage. The articular cartilage is a smooth substance that protects the bones and helps them to move easily. The elbow joint is held together with the help of muscles and ligaments.