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Review Question - QID 215021

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QID 215021 (Type "215021" in App Search)
A 14-year-old boy presents to the urgent care clinic complaining of right knee pain. He plays lacrosse and has been practicing for 2 hours a day in preparation for the upcoming season. He denies any acute injuries or trauma to the knee. He has no other medical problems and does not take any medications. The patient’s temperature is 99.2°F (37.3°C), blood pressure is 118/78 mmHg, pulse is 68/min, and respirations are 16/min. His body mass index (BMI) is 22.4 kg/m^2. Physical exam is notable for a palpable bony prominence approximately 3 cm below the inferior margin of the patella. His pain is reproduced on resisted knee extension. There is no clicking or locking upon passive range of motion around the knee. What is the pathophysiology of the most likely underlying condition?