I fell almost like if I was doing a pleat (ballet movement) a week ago felt a snap on my left knee, could not get up from floor for 10 minutes ir so then did so very painfully. When I woke up in morning, i could not bear the pain, knee was swollen, bruising by the patella and the inner part of knee. A couple of days later after rice, immobilization, crutches and nsaids still have pain but not as much. Hard to walk, pain by patella, thigh, and tibia and pulsating feeling on ankle, knee and thigh. Please advise