I noticed last night during Cleveland's NBA playoff game, Lebron James' was icing his knees after taken out of the game. And, based on the way he played and was walking around, he clearly wasn't hurt. So I assume it was a precaution/prevention approach.
Nothing wrong with icing the knees, even in the absence of pain. If icing due to pain, get knees checked out to be sure that there isn't something going on inside the knee.
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