You have put your question very well with all the necessary details.Growing pains may well be the cause of your son's knee pains as these pains can particularly affect children from 8 to 12 years. If his pains become more regular or if you are at all concerned about your son it would be best to consult an orthopaedic specialist as there is a condition called Osgood-Schlatter disease that needs to be excluded. Your son is probably too young to have this condition, but it needs to be kept in mind if his symptoms become more troublesome.
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