I woke up a couple weeks ago, and I had some pain in my right knee that made it hard for me to bend it. It escaladed to the point where if I straighten it or at least try to it kills me as well as bending it and putting pressure on it by kneeling on it. I have a past of rheumatoid arthritis but I don't know if this would have to do with my knee or it go on everyday for the past few weeks. A lot of forums say I tore my miniscus but I don't think a person can do that in their sleep.. Can someone please tell me what they think it might be?