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A 14yo female soccer player comes to the ED complaining of bilateral knee pain x 1 month, right greater than left. She does not recall a specific traumatic injury or fall, nor of any knee swelling, popping, or locking. The pain is worse after soccer practice or a game, and after getting up from sitting for a prolonged period such as her 2-hour block classes. The pain is described as behind the knee cap. There is no knee effusion, and there is full active range of motion. She has been afebrile throughout the course.