The skeletal architecture of the distal radioulnar joint (DRUJ) provides minimal inherent stability; the sigmoid notch is shallow, and its radius of curvature is 50% greater than that of the ulnar head.1 Thus, the DRUJ relies heavily on softtissue (ie, ligament, muscle) support for stability. The structures that contribute to DRUJ stability are the pronator quadratus muscle, extensor carpi ulnaris (ECU), interosseous membrane, DRUJ capsule, and components of the triangular fibrocartilage complex (TFCC).2