Interosseous Border Of The Radius, Medial View

Description

Radius anatomy centers on the sharp interosseous border (margo interosseus radii) along the medial aspect of the radial shaft. In this medial view, the crest runs longitudinally between the anterior surface and posterior surface of the diaphysis, oriented toward the adjacent ulna where the interosseous membrane spans the interosseous space. Proximally, the border approaches the region just distal to the radial tuberosity, while distally it continues toward the ulnar notch of the radius near the distal radioulnar joint (DRUJ). Bone texture and the crisp ridge profile make the membrane attachment line unambiguous. A key landmark. That attachment is not academic. Disruption of the interosseous membrane, classically in an Essex-Lopresti injury after radial head fracture, permits proximal migration of the radius and can destabilize the DRUJ, so appreciating the exact course of the interosseous border helps explain why pain may localize distally even when the index injury is at the elbow. For forearm shaft fractures, plating strategy and safe corridor planning depend on knowing which surface transitions into this medial crest, since it marks the boundary between muscular origins on the anterior and posterior compartments and the fibrous linkage that transmits load between radius and ulna during pronation and supination. Orthopedic teaching files can pair this illustration with discussions of the interosseous membrane, DRUJ instability, and fracture patterns such as Galeazzi lesions, while anatomy courses can use it to anchor surface terminology from Terminologia Anatomica on a single, legible bony ridge. Medical publishers will also find it well suited for surgical approach diagrams that need a fixed medial reference of the radial shaft without distraction from surrounding soft tissues. Anatomical accuracy verified by SciePro's Medical Advisory Board.