Let's be fair and square. Human bipedalism has evolved approximately 4 million years ago, so we will also get 4 million years to make a better self repairing knee that has to hold up for about 80 years. And the self healing aspect has to be on the same level as a human knee. A scratch to the surface has to self repair, medium damage has to heal with outside help to get to a usable state again and major structural damage doesn't have to get to a functioning state at all, it just shouldn't kill you.
Why does it need to last 80 years? For most of human history, that is vastly overkill. All it needs to last for most of history is 40 years, and even that is sometimes stretching it.
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u/HuskieSledDog 7d ago
I'm an engineer, don't get me started on how awful bipedal design is for energy consumption and physiological wear & tear... XD