You can connect the limb itself, but making it usable involves connecting all the muscles, tendons, everything and hoping the body doesn’t reject it too much.
It’s why it’s taken us so long to get artificial limbs that cab be sorta moved while paired with lots of physical therapy, except there is slightly less worry of the body rejecting the artificial limb. And artificial limbs are crazy expensive, if memory serves. Even cosmetic prosthetics are very expensive. I’ll admit I don’t know all the science, but growing up I had the exact same question.
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