What will happen after 15-20 years post-knee replacement?

This is a conservative estimation, after 15-20 years or even up to 30 years, it can be working perfectly. Some might have no pain or no symptoms and are absolutely healthy. If unfortunately the knee replacement reaches the end of its lifespan, you can change it. Americans are more advanced, they do a lot more than us in learning how to tackle these problems, thus I learn all their special techniques to do revision surgery. If after 15-20 years you reach the end of the expected lifespan, you can still change it. Also if you take good care and there is no pain or swelling, then there’s absolutely no need to go for it.