Lateral Posterior Border Of The Radius, Posterior View

Description

Radius anatomy dominates the frame in a posterior (dorsal) view, emphasizing the lateral posterior border as a straight longitudinal ridge along the shaft that descends to the base of the styloid process. Proximally, the ridge sits lateral to the posterior surface of the radial shaft and remains distinct from the sharper medial interosseous border, which faces the ulna across the interosseous space. Distally, the border tapers toward the dorsolateral aspect of the wrist, adjacent to the styloid process and the dorsal cortical contour that forms the bony roof for extensor compartments. Orientation is unambiguous. Surface landmarks on the dorsal radius matter when teaching forearm compartment anatomy and when planning fixation, because cortical ridges guide implant positioning and help avoid tendon irritation. Dorsal plating or dorsal-percutaneous screw trajectories after distal radius fracture (for example, Barton-type dorsal rim injuries) demand a reliable sense of where the dorsolateral margin runs as it approaches the styloid and the first extensor compartment, where abductor pollicis longus and extensor pollicis brevis tendons course. The fixed posterior perspective also clarifies why small changes in plate position can increase attrition risk for extensor tendons over the dorsal radius. Orthopedic and anatomy faculty can drop this illustration into upper-limb osteology labs to distinguish borders from surfaces and to anchor palpation discussions around the radial styloid and dorsolateral wrist. Authors preparing operative technique guides for distal radius fixation, musculoskeletal ultrasound orientation pages, or radiographic positioning primers will also find it well matched to posterior cortical terminology. Anatomical accuracy verified by SciePro's Medical Advisory Board.