Anyone know about floating knee?...?!

a friend had knee surgery for torn cartilage 30years ago!. He would sometimes get a stiff knee but no pain even near to what he is feeling now!. He has no screws, plates, pins, etc!. in his knee!. Now all of the sudden he is in such pain he can barley walk or stand!. It hasn't swelled, and he feels pain like it's locked up!. ThanksWww@Answer-Health@Com

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