Os trigonum

Case contributed by Dr Bruno Di Muzio

Presentation

Trauma history.

Patient Data

Age: 19
Gender: Female

Left ankle X-ray

Modality: X-ray

Os trigonum is present. Signs of posterior joint effusion are also noted. 

Modality: Annotated image

Os trigonum is delineated. 

Case Discussion

Os trigonum is one of the bony ossicles of the foot and can be mistaken for a fracture. It sits posterior to the talus on the lateral foot radiograph and represents failure of fusion of the lateral tubercle.

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Case Information

rID: 39455
Case created: 5th Sep 2015
Last edited: 5th Sep 2015
Inclusion in quiz mode: Included

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