Piece of pie sign (wrist)

The piece of pie sign refers to an abnormal triangular appearance of the lunate on a PA image of the wrist representing either lunate dislocation or perilunate dislocation 1,2. A lateral image will help differentiate whether there is lunate or perilunate dislocation, with lunate dislocation demonstrating a spilled teacup sign. This is largely due to disruption of Gilula arcs and disruption of the spaces between the proximal and distal carpal bones.

Article information

rID: 18250
Section: Signs
Synonyms or Alternate Spellings:

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Cases and figures

  • Figure 1: piece of pie
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  • Case 1: lunate dislocation
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  • Case 2
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  • Case 3
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  • Case 4
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  • Case 5
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