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Knee pain in an 81-year-old man

Knee pain in an 81-year-old man

An 81-year-old man presented to an urgent care facility with a 1-year history of pain in his right knee. He stated that the pain had become more severe over the previous 2 months but denied any acute trauma or injury. The physical examination revealed that the knee had limited range of motion.

The accompanying anteroposterior x-ray view of the patient's right knee was obtained. What does it show? What is your interpretation?

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