Is stem cell regeneration an option for my husband?

Looking at and researching stem cell regeneration-Inherited genetic tendency for brachial plexus neuropathy-my husband has large percentage of family members that have had “episodes” where the nerve sheath has been damaged. Research was done. It’s found in a few large families across the country. The location of genetic mutation was found. That was the end of the research. Currently, he is having another episode. Pain and numbness down his arm into his hand. Probably sheath was injured from working out-which he does to keep muscular tone to prevent nerve injury! Permanent damage to left arm from previous episode. Now episode is in right arm. Anyone have feedback on stem cell regeneration for peripheral neuropathy? Much of papers I’ve read are from a few years back.