I was playing basketball last night, I drove to the basket, and did a quick jumper. All of a sudden I felt a pop inside my knee. I went down immediately, I was able to walk about 3 or so minutes after the pain went away. I was able to walk, however, pain existed over the MCL area, as well as the back of knee. There was minimal swelling last night, I had more range of motion, but today I can barely move it. I know that is the bodies way of protecting the injury. It's not too swollen, just enough to cause pain when I try to fully extend it, or bend it. I can put weight on it still, but it seems like it is still weak. The question is, any doctors or sports specialists have any idea what this could be? I researched and think it may be a grade 1 or 2 MCL sprain. Since it is the holidays, don't feel like bugging the sports injury specialist. The pain is most on the inside of knee, and when I bend or try to extend the knee, hurts inside the knee when I try to over extend, which I read that could be PCL injury. Any ideas?