Radial Styloid Process, Posterior View

Description

Radial styloid process anchors the lateral margin of the distal radius in this posterior (dorsal) view of the forearm skeleton. The pointed styloid projects distally and slightly laterally, while the ulnar notch lies medially where the distal radioulnar joint forms with the ulnar head. Dorsal surface contours of the distal radius are emphasized, including the region of the dorsal tubercle (Lister tubercle) proximal to the radiocarpal articular surface, a landmark that separates extensor tendon grooves across the back of the wrist. Clinical interpretation of the radial styloid benefits from a dorsal perspective because so many painful wrist conditions localize to this lateral bony prominence and its tendon relationships. Tenderness at the styloid is classic in de Quervain tenosynovitis, where the abductor pollicis longus and extensor pollicis brevis traverse the first dorsal compartment adjacent to the styloid and can be provoked by Finkelstein testing. It is also the site of radial styloid (chauffeur) fractures and a reference point when assessing scaphoid injury patterns, since the scaphoid lies immediately distal to the styloid at the radial side of the radiocarpal joint. Palpation matters. Use this illustration in upper limb anatomy teaching to reinforce distal radius landmarks, in radiography or orthopedic modules when correlating dorsal wrist surface anatomy with PA and lateral wrist imaging, or in hand therapy and sports medicine materials that explain lateral wrist pain generators and splinting targets around the radial styloid. It also supports surgical and procedural education, such as dorsal wrist approaches and precise localization of extensor tendon compartments relative to Lister tubercle and the styloid. Anatomical accuracy verified by SciePro's Medical Advisory Board.