question: I had knee replacement in 2008 and 2011. Both knees have never been an improvement as far as pain and mobility. What are the reasons for knees to remain painful. Could I be reacting to the glue. I have been told by dr. That there is nothing wrong with knees. I just completed four months of pt and no improvement. I can t stand the pain and sleepless nights trying to get comfortable. Morphine does not help.