What’s Your Diagnosis?

In this feature, AAOS Now publishes a series of images, challenging readers to diagnose the condition depicted.

This month’s challenge was submitted by Letha Y. Griffin, MD, of Atlanta, Ga. Dr. Griffin reports that the patient, a 42-year-old woman, had a history of being unable to bend or extend her right knee after squatting. The patient also reported feeling something slip inside her joint. She had no prior history of an injury to the knee.

Physical examination of the right knee found a range of motion of 40° to 90° and diffuse tenderness to palpation about her joint. No knee instability was detected. An effusion was noted within the joint. Routine radiographs were normal. Figures show a sagittal MRI view (Fig. 1), a pathology slide (Fig. 2), and an arthroscopic view (Fig. 3).

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