I have been doing a lot of research on stem cell therapies and I can say it is VERY promising for many injuries to soft tissues and chronic inflammation. If you want to get informed a bit I would suggest watching the Joe Rogan podcast #1066 In that one he has Dr.Neil Riordan who is a pioneer in the field out of Panama. The more I did research I realized that BIG PHARMA is trying to quell the noise around it because they can't make any $$ off of it like they do Drugs with patents.
If he does try the therapy I think he might get some good results from it...here's hoping anyways.