I hurt my left knee today from practicing tennis. My coach was feeding me shots away from me to practice my side to side movement and recovery. As, I was running for a backhand, I felt a sudden pain in my knee. I can still walk, but it isn't comfortable running. I have a few symptoms. One of my symptoms is when I walk, I feel a need left and bend my leg, in order to "crack" my left knee. I am usually able to create this cracking, but sometimes I am not. Another symptom I have is when I do a hamstring strech, I can't even touch my toes (normally I can touch past them) because when I try streching this far, I FEEL A SHARP PAIN IN THE INSIDE OF MY KNEE. The inside of my knee also hurts when put weight on it while running. I did some research and I think it might be a sprain in my medial miniscus, but I'm not sure. Does anyone have any other ideas what this injury might be? Also, does anyone know the best way to make this injury better? Thanks.