This short video of a guy operating a motorized prosthetic foot is really interesting: https://videos-fms.jwpsrv.com/0_6146535c_0xe8e28ca538bc35a69b006713071a0

This short video of a guy operating a motorized prosthetic foot is really interesting: https://videos-fms.jwpsrv.com/0_6146535c_0xe8e28ca538bc35a69b006713071a06705dc7e945/content/conversions/S0hKKJpn/videos/vQlslyFq-25287416.mp4 https://videos-fms.jwpsrv.com/0_6146535c_0xe8e28ca538bc35a69... And this article does a better job of explaining the surgery: https://bionicsforeveryone.com/agonist-antagonist-myoneural-interface-ami/ https://bionicsforeveryone.com/agonist-antagonist-myoneural-... I guess, in a nutshell, they attach a small amount of muscle to the nerve that controls something that's going to be cut off. And they anchor that muscle on both ends. So that contracting and relaxing it provides a real-world force feedback loop. Really clever.