I am a 53 year old male who has been walking my whole life, lately my right knee has been locking up and I get a bad burning pain just about were my knee bends. This just came on all of a sudden about two weeks ago. It dosen't happen all the time, but when it does the pain is a hot burning type pain. It burns for awhile and I have trouble walking and then it just goes away for days at a time until it happens again. Does anyone know what it could be or what is causing this pain.