I hurt my knee in March when changing directions quickly at work, I had small swelling posterior and inferior to knee joint, have been to therapy which made pain worse, had MRI negative and now nerve conduction study negative, pain now radiates down from posterior knee down into my lateral foot. Pain when leg fully extended when driving car and when flexed past 90 degrees. I have iced and had cortisone shots, tried therapy I am so tired of hurting any ideas????