<P> The radiocarpal joint or wrist joint is an ellipsoid joint formed by the radius and the articular disc proximally and the proximal row of carpal bones distally . The carpal bones on the ulnar side only make intermittent contact with the proximal side--the triquetrum only makes contact during ulnar abduction . The capsule, lax and un-branched, is thin on the dorsal side and can contain synovial folds . The capsule is continuous with the midcarpal joint and strengthened by numerous ligaments, including the palmar and dorsal radiocarpal ligaments, and the ulnar and radial collateral ligaments . </P> <P> The parts forming the radiocarpal joint are the lower end of the radius and under surface of the articular disk above; and the scaphoid, lunate, and triquetral bones below . The articular surface of the radius and the under surface of the articular disk form together a transversely elliptical concave surface, the receiving cavity . The superior articular surfaces of the scaphoid, lunate, and triquetrum form a smooth convex surface, the condyle, which is received into the concavity . </P> <P> Carpal bones of the hand: </P> <Ul> <Li> Proximal: A = Scaphoid, B = Lunate, C = Triquetrum, D = Pisiform </Li> <Li> Distal: E = Trapezium, F = Trapezoid, G = Capitate, H = Hamate </Li> </Ul>

The wrist and ankle have what type of movement