Piece of pie sign (wrist)
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At the time the article was created Andrew Dixon had no recorded disclosures.View Andrew Dixon's current 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
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.
- 1. Bridgeforth G, Cherf J. Lippincott's Primary Care Musculoskeletal Radiology. Lippincott Williams & Wilkins. (2010) ISBN:0781793777. Read it at Google Books - Find it at Amazon
- 2. Newberry JA, Garmel GM. Image diagnosis: perilunate and lunate dislocations. Perm J. 2012;16 (1): 70-1. - Free text at pubmed - Pubmed citation