hello, I play volleyball, which is hard on the knees from diving to jumping all the time... a few months ago I dove and hit my knee on the groung very hard. My knee pain went away and it recently has come back. It feels like a knife goes into my knee right below my knee cap every time i jump or put a lot of pressure on it like trying to stand up. I have been icing it, but it won't go away....Does anyone 1. Know what is wrong? or 2. Know how to fix it?