I had partial replacement 4 1/2 years ago at 3 1/2 it loosened and had a revision to a total knee replacement. It has been one year this month sense replacement and I only have 100 degrees bend I had a follow up appointment this past Friday due to having server pain at night my doctor feels it is soft tissue causing the pain and I would probably agree as I have zero pain as long as I am up and moving. At this point he has no recommendations for me to correct this issue I can deal with the pain but the lack of sleep is really starting to wear on me I am currently 47 years old and very active sure wish I could find a solution.