Edit: Thanks, everyone!
I know an incredibly smart senior here near Milwaukee County, WI who’s disabled by MS and has been restricted to using a scooter for years. He’d love to walk again, but I but I don’t know how he can get involved in studies like this: https://www.nature.com/articles/d41586-025-00863-0
All I could find was the ISSCR (Int’l Society for Stem Cell Research), but I don’t think reaching them directly would be fruitful, would it?
In my experience stuff like this starts with your primary healthcare provider.
They would research it on your behalf or connect you with a specialist on that topic.