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Ulnar styloid fracture

Last revised by Dr Mostafa El-Feky on 02 Jan 2021

Ulnar styloid fractures occur in association with ~60% of distal radius fractures. Most of these are small avulsion fractures involving the tip of the ulnar styloid.

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.

The fracture is easy to recognize on plain film. Sometimes the fractures may not seem very apparent on x-ray if there is no displacement.

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.

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. It is argued that these injuries, therefore, need open stabilization.

Wrist pathology

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Cases and figures

  • Case 1: isolated
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  • Case 2: with distal radius fracture
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  • Case 3: on MRI with TFCC injury
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  • Case 4
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  • Case 5: with Smith fracture
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  • Case 6: pathological fracture from gout
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  • Case 7: with distal radius fracture
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