As you can see very soon we can obtained the electronics from manufacturers at small prices to enhance a prosthetics to communicate with the nerve and muscles.
There are already such devices in large circulation in US for those who have a slight lack of strength on moving their feet upwards during the walk.
However the patient manually alters the power output, the software that automates that require Machine Learning algorithms to learn from the patient movements to forecast how much power output needed.
The electronic is available, the implants are available, the 3D printers are available, but the problem resides (in North America) where the medical industry makes vast profits out of these and they kill any R&D that might compete with them.
We are gearing to open source the software required for the implant development. It is not easy and will take a few years to master and develop.