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Ulna / Ulnar Shaft Fracture

 

(see also: Both Bone Forearm Fracture: / Ulnar Styloid Process)

Anatomy

  • radius & ulna lie parallel to each other when forearm is supinated;
  • during pronation radius crosses ulna, rotating on axis that passes from capitulum through the distal end of ulna;
  • ular side of wrist is supported by TFCC, which articulates w/ both lunate and triquetrium;
  • ulnar attachment of TFC is to base of ulnar styloid & distally to triquetrum w/ volar ulnocarpal ligaments;
  • interosseous membrane:
    • radius and ulna are joined by proximal & distal RU joints & by interosseous membrane, which is directed obliquely downward from radius to ulna;
    • since ulna does not articulate w/ carpi, direction of interosseous membrane is important in transmission of longitudinal forces from radius to ulna;

Radiographs

  • in the child, it is essential to have 3 views of the elbow: (AP, lateral, and oblique) before a Monteggia frx can be ruled out;
    • this is especially true in proximal ulnar shaft frx;

Pediatric Ulnar Fracture »

Adult Ulna Shaft Fracture

References