E.R. star John Stamos came to the aid of an extra on the show after he fell
and dislocated his knee. The actor - who plays paramedic Tony Gates in the hit
show - leaped into action and packed ice around the fallen actor's joint before
popping it back into place.
He said, "You dislocated it. I did the same thing to my own knee. Keep the
ice on it for a while. It should be fine."
Stamos stayed with the extra until a studio nurse - who confirmed his
diagnosis - could attend to him.
or so reports http://www.starpulse.com