Piece of pie sign (wrist)

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

Citation, DOI, disclosures and article data

Citation:

Dixon A, El-Feky M, Ramsey, MD A, et al. Piece of pie sign (wrist). Reference article, Radiopaedia.org (Accessed on 28 May 2023) https://doi.org/10.53347/rID-18250

DOI:

https://doi.org/10.53347/rID-18250

Permalink:

https://radiopaedia.org/articles/18250

rID:

18250

Article created:

22 Jun 2012, Andrew Dixon ◉

Disclosures:

At the time the article was created Andrew Dixon had no recorded disclosures.

View Andrew Dixon's current disclosures

Last revised:

16 Dec 2019, Adam Eid Ramsey, MD

Disclosures:

At the time the article was last revised Adam Eid Ramsey, MD had no recorded disclosures.

View Adam Eid Ramsey, MD's current disclosures

Revisions:

11 times, by 9 contributors - see full revision history and disclosures

Systems:

Musculoskeletal

Sections:

Signs

Tags:

wrist, lunate, carpal bones, refs

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.