Osseous anatomy and articular relationships about the distal ulna.

The distal radio-ulnar joint (DRUJ) has a bony anatomy that contributes very little to stability. This article discusses the osseous anatomy about the distal end of the ulna. The structures that support the stability of the DRUJ, such as the triangular fibrocartilage complex, the tendon sheath of the extensor carpi ulnaris, the pronator quadratus muscle, and other tendons on the ulnar side of the wrist are reviewed.