Interosseous wrist ligaments and palmar radiocarpal ligaments. Key ligaments are radioscaphocapitate, long and short radiolunate, and ulnar carpal ligaments (ulnolunate, ulnotriquetral, and ulnocapitate ligaments). C, Capitate; H, hamate; I, first metacarpal, L, lunate; P, pisiform; R, radius; S, scaphoid; Td, trapezoid; Tm, trapezium; U, ulna; V, fifth metacarpal. (From Mayo Foundation.)