re: Knee replacement. How did you know when it was time?

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How did you know when it was time?

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As said earlier, you know it's time when it effects your quality of life. If your knee(s) are limiting your physical activity than you have a big problem. Decreased activity will lead to increased weight and decreased metabolism. Which in turn will lead to greater knee degradation.

Knee replacements last roughly 20 years. But, the technology is always advancing. If you get a revision in 20 years, at 75, then that should last you until your 95. It will probably last longer if you take care of yourself, plus advancements in the tech could make it so your revision (if you get one) last 30+ years.

Most knee replacements have great outcomes. The first week you will feel like you made a mistake. But suck it up and do what your therapist tells you. Getting functional range of motion, most importantly full extension, is the most important thing for rehab.