The US is developing [ tiny neural modulators ]( http://www.extremetech.com/extreme/188908-darpas-tiny-implants-will-hook-directly-into-your-nervous-system-treat-diseases-and-depression-without-medication ) as implants to modify the function of particular nerves in the brain. I am suspicious of the idea of using this to treat arthritis. Arthritis is not a brain condition; it is a disorder of joints. A neural modulator might alter the sensation of pain from arthritis but that would not make the joint any better. It might over time do just the opposite.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#02_September_2014_%28Neural_modulators%29