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Pooping duck sign

Last revised by Dr Mostafa El-Feky on 17 Jun 2022

Pooping duck sign indicates the presence of a triquetral fracture on a lateral wrist radiograph, where an avulsed fracture fragment from the dorsal cortex of the triquetrum projects along the dorsal aspect of the osseous structures of the wrist.

In this sign, the fracture fragment represents the poop dorsal to the duck. The duck is created by the confluence shadows from osseous structures in the proximal carpal row, including the scaphoid (head and neck of the duck), lunate (body and wings of the duck), and dorsal cortex of the triquetrum (tail of the duck). 

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Cases and figures

  • Figure 1: illustration
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  • Figure 2
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  • Case 1: Triquetral bone fracture
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