@stanstory these were links from the Stem Cell Therapy for Neuropathy discussion that may hold some promise but I don't know of any clinical trials that have been done specifically for stem cell injections other than for diabetic neuropathy. I'm sure there are a lot of small clinics doing their own thing and not approved by the FDA so you really have to do your own research.

‘Amazing’ New Stem Cell Treatment for Neuropathy (July 2015)
— https://www.painnewsnetwork.org/stories/2015/7/12/amazing-stem-cell-treatment-for-neuropathy

National Institutes of Health – Mesenchymal stem cells to treat diabetic neuropathy: a long and strenuous way from bench to the clinic
— https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4979500/

Here's a couple of other links for more information...

Sizing Up Sizzling FDA Warning Letter to Fat Stem Cell Clinic Stemgenex (Nov 2018)
-- https://ipscell.com/2018/11/sizing-up-sizzling-fda-warning-letter-to-fat-stem-cell-clinic-stemgenex/

FDA Sends Warning Letters To Stem Cell Clinics After A Dozen Patients Became Seriously Ill From Injections (Dec 2018)
-- https://khn.org/morning-breakout/fda-sends-warning-letters-to-stem-cell-clinics-after-a-dozen-patients-became-seriously-ill-from-injections/