Piece of pie sign (wrist)

Last revised by Dr Adam Eid Ramsey, MD on 16 Dec 2019

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.

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: piece of pie
    Drag here to reorder.
  • Case 1: lunate dislocation
    Drag here to reorder.
  • Case 2
    Drag here to reorder.
  • Case 3
    Drag here to reorder.
  • Case 4
    Drag here to reorder.
  • Case 5
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.