Interosseous Membrane of the Forearm, Posterior View

Description

Running between the posterior shafts of the radius laterally and the ulna medially, the interosseous membrane is rendered as a broad syndesmosis spanning from the proximal forearm toward the distal radioulnar region. Its fibers bridge the interosseous borders, leaving the bony contours of the radial and ulnar diaphyses readable along either side. Distally, the membrane tapers toward the wrist, where the distal radius lies proximal to the carpal row and the distal ulna approaches the ulnar side of the wrist complex. Bony landmarks remain crisp. A posterior angle clarifies how the radius and ulna maintain a fixed inter-bone relationship during pronation and supination while still permitting rotation, and it highlights the membrane’s role in load transfer from the distal radius toward the ulna and elbow. This is the anatomy behind Essex-Lopresti injury, where a radial head fracture with disruption of the interosseous membrane and distal radioulnar joint leads to proximal migration of the radius and chronic wrist pain if missed. Surgeons planning radial head fixation or arthroplasty often reference these relationships when assessing longitudinal forearm stability and DRUJ competence. Orthopaedic teaching files, upper-limb anatomy courses, and exam preparation materials benefit from this focused view when discussing syndesmosis, forearm compartment septa, and the mechanics of the radioulnar joints. It also suits operative technique chapters on DRUJ instability, interosseous membrane reconstruction, and post-traumatic forearm instability, where a clean posterior presentation helps orient readers quickly. Anatomical accuracy verified by SciePro's Medical Advisory Board.