I would not have a TKR! One knee turned out O.K. but the other has turned my quality of life upside down. An unsuccessful TKR can have an adverse effect on your total health from lack of exercise, weight gain, poor sleep, etc., not to mention the mental impact. I'm very pain tolerant but seven years is a long time. I have not kept up with the latest TKR procedures but I understand there are advancements. I understand there is a procedure where they enter from the side eliminating cutting the quad muscle and other ligaments. It's a more complicated procedure and they claim less pain and quicker recovery. From what I read on forums including this forum my confidence in having another surgery is low.