Now can someone who knows and wants to save me some time and earn a TP tell me if the C's medical staff ever said Pierce's knee was a sprain? I would be less concerned about a bruise.
Sprains, if while playing with them, someone overcompensates too much, can get worse and lead to other problems, ligaments, etc. All you can do with a bruise is hit it and aggravate it although, again, overcompensation can lead to other injuries.