![]() It is argued that these injuries, therefore, need open stabilization. It is believed that lack of union of these avulsion fractures does not significantly affect late functional results. Fractures at the very base of the ulnar styloid can cause instability of the distal radioulnar joint (DRUJ) and disruption of the triangular fibrocartilage complex (TFCC) insertion at the ulnar fovea. Pseudoarthrosis of the processus styloides ulnae Pseudoarthrosis of the processus styloides ulnae Monatsschr Unfallheilkd Versicherungsmed. In the pediatric and adolescent forearm, it should be remembered that in very rare situations the ulnar styloid can arise from a separate ossification center, but mostly separation is caused by injury. The most common cause of ulnar styloid fracture, or any other wrist fracture, is falling onto an outstretched arm. Sometimes the fractures may not seem very apparent on x-ray if there is no displacement. Den udgår medialt på bagsiden af knoglen. The fracture is easy to recognize on plain film. Processus styloideus er et lille fremspring i den distale ende a ulna. Usually, this kind of fracture occurs as the result of a fall on an outstretched arm and is often associated with a distal radius fracture. Der Processus styloideus ulnae, kurz PSU, ist der Griffelfortsatz der Elle ().Er überragt nach distal das Caput ulnae.Sein abgerundetes Ende dient den Fasern des Ligamentum collaterale carpi ulnare als Ansatz.
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