pop in knee

[poppa k]

well, about a month go i hurt my knee squatting. I limped around for about a week or two nursing it trying to keep weight off of it, and it slowly got better. However, although there isnt pain all the time anymore, i cant run, stand in some positions with weight on it, and there is a POP now. That is what i am conscerned about most. Anyone have this pop before? If so what was wrong with your knee? I can walk up stiars fine...walk fine, run...eh, i dont push it. But there is definately a pop when i go into a step and when i flex my quad. The pop comes from the knee and seems to be right down the center.