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Case
A 78-year-old man presents to an urgent care center with bilateral knee pain that he has had for 1 week. The pain is worse in his right knee and is worse with ambulation. He says that he has not experienced any recent trauma, but he does note that he has been helping his son move into an apartment. He reports no fever, dizziness, chest pain, or shortness of breath. He has hypertension, for which he takes lisinopril. He is a nonsmoker. View the image taken (Figure 1) and consider what your diagnosis would be.

Knee Pain in a 78-Year-Old