Hi all, I would like to have some insights on what is going on with my left knee.I know i should go see a doc but i am still a student and i cannot afford it just yet.So i want to make sure that go to the doc is really worth my money.I am pretty tight in cash now. First thing first, my left knee does not hurt when i do a lunge or stretch out when i receive a net shot or a defend a cross court smash.However what disturbs me most is that the is always a "Clack" sound that comes from the top my left knee.Even when i bend my knee while i just bend my knee druing warm up. It can hurt if i play a very long game of rallies and running around.Even when i jog at times i hear the "clack" sound which is very disturbing to me.I have been having this problem for months and recently it has made me very worried. It is a joint problem or something else..I have search online for more info but there is nothing that i can seem to know what is really wrong with it.. Please help me out!! Thank you!!!