Traumatic patellar luxation

Case contributed by Dr Bruno Di Muzio

Presentation

Knee swelling for a few days, after a fall, unclear mechanism of trauma.

Patient Data

Age: 70
Gender: Female
CT

CT Right knee

Lateral dislocation of patella, joint effusion and laxity of the patellar ligament and quadriceps tendon. There are a few small loose bone fragments adjacent to the patella. The presence of pnsumoartrosis without a penetrating trauma is concerning for infection, particularly considering the age group and the unclear trauma history and mechanism. 

Case Discussion

The features are suggestive of a traumatic patellar lateral dislocation. Pneumarthoris without an obvious break in the skin and, in the setting of this unclear trauma history a few days ago in an elderly patient, is concerning for associated septic arthritis. 

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Case information

rID: 22261
Published: 23rd Mar 2013
Last edited: 7th Apr 2018
Inclusion in quiz mode: Included

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