This is not my area, I think this is starting to be developed using the small electrical currents from muscles in the part of the body the synthetic limb is attached to.
I think this again goes back to how the robotic limb would interact with the natural body. Artificial limbs have the strength with bone-like structures, but then you need all of the other tissues to function alongside. This organisation within our bodies is sooooo complicated that interacting a man-made robotic limb with a biological tissue will be very challenging.
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