Fabella

Case contributed by Dr Henry Knipe

Presentation

Fall at the races. Tender patella.

Patient Data

Age: 55
Gender: Male
Modality: X-ray

No fracture or malalignment. No definite knee joint effusion. Pre-patella soft tissue swelling consistent with bruising/haematoma given recent history of trauma. Incidental note of a fabella.      

Modality: Annotated image

Red circle highlights the fabella. 

Case Discussion

A fabella is a common accessory ossicle found in the lateral tendon of the gastrocnemius. It should not be confused for a fracture or an ossified intra-articular body.

Pre-patella soft tissue swelling is well seen on lateral knee radiographs and important to comment on as it is often clinically confused for a joint effusion. 

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Case Information

rID: 25793
Case created: 8th Nov 2013
Last edited: 11th Jan 2017
Tags: knee, variant
Inclusion in quiz mode: Included

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