Many possibilities: In all honesty, an exam of his knee would yield many more detailed opinions. However, pain below the knee in a 13-year old is often Osgood-Schlatter syndrome. This occurs when the patellar tendon and growth plate attachment at the shin bone become inflamed. There is another similar condition at the lower base of the kneecap. A patella that is not tracking exactly right could give similar symptoms.
Answered 10/28/2017
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Mgt: I would recommend an exam. Popping may be one sign of injury, in addition watch for swelling and redness.
Answered 10/28/2017
498 views
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