I had one knee replaced 10 years ago and the other 6 yrs. ago, the swelling has never gone down in either knee. Two weeks ago I got severe pain in both of them after do some gentle exercise the day before, I had x-rays and the Dr. said nothing was out of place. They looked good. There is a constant ache in one knee still and in the back of the knee. They hurt is I sit too long or put pressure on either knee, Does anyone else have problems with their knees so long after the surgery or either still have swelling?