@melcpa86 My second TKR (total knee replacement) was in October 2017, I just had my one year check-up last Thursday. My first was six years ago. I had more pain after this one than after the first so my ortho was seeing me every two weeks to keep track of it, he is very good. It suddenly lifted at about the 6 week mark, and things went much better then! At any rate, I think you should make an appointment and see your ortho just in case there is something wrong, I don't think it should bother you for that long. It's always best to have them evaluate it. I was very pleased that mine stayed on top of it until it was better. If anyone is in the Boston area, I would highly recommend him. He is actually very well known beyond the Boston area, and is the primary developer of a custom made replacement knee.
Now, the one I had done more recently is great. We were on vacation recently and I was walking over six miles a day! The knee that was done 6 years ago does still hurt a bit after that much walking but the one I had done last year was tired, but painless. Unfortunately it never did get the desired amount of flex, but the doctor said he can go in, in an outpatient procedure, and snip some scar tissue that will help with that. I think I will do that after I have addressed a couple of other, unrelated issues.
JK

going on 6 years from operation and still have swelling and pain. I do more biking than walking and that helps with pain. IF i had know i would never have had the operation. Second knee i did stem cells and i am happy with the results.
The cause is unknown. Surgeon had no idea of what to do, so i put up with it, ice is what i do. I use no pain pills.