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 Marc Biggers, MD, a resident member at the University of Tennessee–Campbell Clinic.

Dr. Biggers writes that a 15-year-old high-school football player was seen with a 1-week history of anterior knee pain. The youth states that the pain began after he sustained a hit to his knee during a game. The only physical examination finding is tenderness to palpation over his tibial tuberosity. A lateral radiograph (Fig. 1) and lateral and coronal MRIs (Figs. 2, 3) are obtained. What’s your diagnosis?

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