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Published 6/1/2011

What’s your Diagnosis?

In this feature, AAOS Now publishes a series of images, challenging readers to diagnose the condition depicted. The images for this month’s challenge were submitted by Timothy Bert, MD, a resident member at the University of Tennessee–Campbell Clinic. The images are of a 58-year-old male with left knee pain. What’s your diagnosis?

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(Top) AP radiograph and (bottom) magnetic resonance image showing increased uptake in the femoral condyle

Do you have a challenging case you’d like to submit for publication? E-mail a short case description and any accompanying images to

Answer: Osteonecrosis of medial femoral condyle