View from the Anterior of the Capsule of the Distal Radioulnar Joint

Description

Seen from the anterior aspect of the male distal forearm and wrist, the distal radius lies lateral to the distal ulna, with the distal radioulnar joint (DRUJ) capsule spanning between their articular margins just proximal to the ulnar head. The capsular sleeve appears relatively lax anteriorly, reflecting the synovial joint design that allows pronation and supination around the ulnar axis while maintaining close apposition of the sigmoid notch of the radius to the ulnar head. Distal to the DRUJ, the proximal carpal row (scaphoid, lunate, triquetrum) and the bases of the metacarpals provide bony context for the wrist region. Rotation demands space. Clinically, the anterior DRUJ capsule is part of the soft tissue envelope that is stressed in distal radius fractures, Galeazzi fracture-dislocations, and triangular fibrocartilage complex (TFCC) injuries, all of which can leave patients with painful loss of forearm rotation and grip weakness. This anterior perspective helps clarify why subtle capsular attenuation or disruption may permit volar translation of the ulnar head during supination, a pattern encountered during DRUJ instability testing and considered during open or arthroscopic stabilization. It also maps the relationship of the capsule to the volar wrist approach corridor, where respecting periarticular soft tissues helps preserve postoperative rotational mechanics. Use this plate for teaching synovial joint capsule behavior in upper-limb anatomy labs, for orthopaedic and hand-surgery texts discussing DRUJ instability, and for radiology education when correlating clinical examination with CT or MRI evaluation of the distal radioulnar joint and TFCC region. It also suits patient-facing materials explaining why DRUJ sprain can limit turning a doorknob or using a screwdriver. Anatomical accuracy verified by SciePro's Medical Advisory Board.