Posterior Perspective of the Fractured Proximal Radius

Description

Oriented in posterior anatomical position, the proximal radius sits lateral to the ulna, its expanded head and neck aligning with the radial notch of the ulna to form the proximal radioulnar joint. A fracture line is marked near the proximal radius, just distal to the head-neck region and in the neighborhood of the radial tuberosity where the biceps brachii tendon inserts on the anteromedial surface. On the medial side of the frame, the ulna appears longer and more slender, providing a clear reference for forearm length and alignment. Red fracture highlighting isolates the bony disruption without soft tissue distraction. Posterior visualization of a proximal radial fracture matters because these injuries are rarely just a crack in isolation; they often disturb the radiocapitellar articulation and the mechanics of pronation and supination at the proximal radioulnar joint. Loss of radial head congruity can lead to posterolateral rotatory instability at the elbow, and comminuted patterns raise concern for associated interosseous membrane disruption (Essex-Lopresti), with proximal radial migration and wrist pain that may be missed early. Nerve proximity is part of the story too. The posterior interosseous nerve courses near the radial neck and can be irritated by displaced fragments or surgical retraction during fixation or radial head arthroplasty. Orthopaedic teaching files and upper limb anatomy courses can use this posterior forearm pairing to explain why the radius, not the ulna, rotates around the longitudinal axis during forearm rotation, and how a proximal radius fracture can limit supination despite an intact ulna. It also fits surgical atlases or patient education for posterior or posterolateral elbow approaches, preoperative planning discussions, and radiology-pathology correlation when matching fracture morphology to expected functional loss. Anatomical accuracy verified by SciePro's Medical Advisory Board.