This past winter , I had both knees totally replaced. Right on Dec 16 then the left on March 17 . Previous to the surgery, I would be in constant pain which would increase as the day went on , to the point at about 3-4 o’clock in the afternoon, I couldn’t stand the pain and have to sit down. 800 mg ibuprofen was the normal thing 2-3 times a day. I’m 64 and decided to dedicate the winter to getting my knees done , only doing one knee would have handicapped me until the other was done. I walked into the surgery center about 7am and walked out at noon with my new knee. The pain is extreme but manageable for the first week but greatly improves with mobility after that . Physical therapy is the key to a successful recovery. My physical therapist was phenomenal, he says you get out what you put in . 6 weeks of pt and I was about 80% , at times after PT , I questioned whether it was worth the aggravated pain of PT but pushed through and glad I did. Fast forward to today , 8 months after the first surgery, I have a little pain when standing after sitting but my dr assured me, it will get better in a few months. My advice, don’t hesitate, get it done , push yourself at PT and you will thank your self.