I'm in the army and we usually run 3 days a week and about 4 miles everytime we run.I start to get sharp pains in the top of my knees after we stop running.It almost feels like a knife is stabbing into my knees everytime i straighten my legs.I can't go to sickcall and get it checked out because the system is corrupt. They'll just give me ibuprofen and tell me to walk it off. Any ideas what it could be?