While bowling , i whipped my right leg behind left leg at the back of knee and hit back of left knee. immediately both back of knees started to hurt . i stopped bowling and stood against the wall. what had just happened, i can t do the bowling three step, and always end up in pain, so i figured ice and rest. eventually the left leg stopped hurting but the right knees pain keeps moving from the swelling above knee, to pain on inside bone to movement and popping in back of knee when laying down and raising leg. now the pain is constant and the weight bearing part is causing a limp. i soak, ice, heat, and rub, but pain is always there, doctor appoint. next week finally any thoughts?