Dorsal defect of the patella

Case contributed by Dr Daniel Zimmermann Stefani

Presentation

Medial knee pain, no recent injury.

Patient Data

Age: 60 years
Gender: Male
MRI

Subcondral bone plate irregularity with intact overlying cartilage at the superolateral aspect of the patella, consistent with a dorsal defect of the patella.

Case Discussion

The dorsal defect of the patella is a normal developmental variant, present in 0.3-1% of the population that can be mistaken with an osteochondral lesion. It is usually asymptomatic, but sometimes it can be a source of anterior knee pain. It is typically located in the superolateral aspect of the patella and usually presents with normal overlying cartilage. Healing may occur spontaneously.

This patient also had a distended pes anserina bursa (not shown), likely the cause of his medial knee pain, with the dorsal defect an incidental finding.

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Case information

rID: 30403
Published: 10th Aug 2014
Last edited: 6th Oct 2019
Inclusion in quiz mode: Included

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