Josephine, you may have answered this before and I didn't see it but could you do so again? Several of us have talked about the tightness we feel inside our new knees. It has been described as a tightness, a balloon, rubber band, swelling, etc; it is not really pain, but since most of us have been taught to 'listen to our bodies', what is going on in there and is it something we should be 'listening to'? Personally, I don't see a corresponing amount of outer swelling that reflects what I 'feel' inside the joint. Any ideas?