<Li> Dorsal radioulnar ligament </Li> <Li> Articular disk (triangular fibrocartilage) </Li> <P> The function of the radioulnar joint is to lift and maneuver weight load from the distal radioulnar joint to be distributed across the forearm's radius and ulna as a load - bearing joint . Supination of the radioulnar joint can move from 0 degrees neutral to approximately 80 - 90 degrees where Pronation of the Radioulnar Joint can move from 0 degrees neutral to approximately 70 - 90 degrees . Supination (palms facing up) vs. pronation (palms facing down). Muscles that contribute to function are all supinator (Biceps Brachii, Brachioradialis, and Supinator) and pronator muscles (Brachioradialis, Pronator Quadratus, and Pronator Teres). </P> <P> Injuries to the distal radioulnar articulation often result from falls onto an outstretched hand . Injury can occur with concurrent fracture of the distal radius, the ulna, or can be isolated . A classification system has been proposed by Estaminet and colleagues . </P>

What type of joint is formed between the radius and ulna