ok well it might sound weird but when i was playing badminton at school me and my partner where in the competition to win. so when the other team had hit the shuttlecock it was about to touch the ground so i ran and slipped, i fell straight on my right kneecap. that was two weeks ago and it still hurts today, plus it has a little lump that i can move around but not see it. so could someone tell me what i might have done to my kneecap. cheers