Fractured fabella

Case contributed by Dr Mohammad A. ElBeialy


Post-traumatic knee pain.

Patient Data

Age: 51 years
Gender: Male

Lateral radiograph of the right knee shows a transverse radiolucent fracture line with irregular borders across an ossified fabella (arrow)  consistent with  fracture of the fabella. No definite fracture is evident in the frontal view. Mild osteoarthritis changes of the knee joint. Slight distension of the suprapatellar bursa by likely small joint effusion.

Annotated image

Arrow indicates fractured fabella. 

Case Discussion

Fracture fabella is a rare entity usually post-traumatic or a stress fracture in patients with total knee replacement. The rare differential diagnosis is bipartite fabella with well-corticated regular margins. 

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Case information

rID: 28301
Published: 20th Mar 2014
Last edited: 16th Jul 2018
Inclusion in quiz mode: Included

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