Hi, has anyone had an ongoing pain at the back of the knee. It started a few months ago and is now a permanent ache. I had an x-ray to rule out osteoarthritis and that came back ok. When I get up from sitting or turn in a certain way, it jarrs and the pain makes me cry out and wince. If I do any walking at all, that seems to make it worse. Would appreciate your thoughts or if anyone has had this problem.