The risk scales with BSSO distance, surgeon expertise(both quality of work, and especially how long the operation takes).

I wish more research was conducted into improving nerve healing using administration of stuff like Cerebrolysin, other neurotrophic, or cellular stress therapy - e.g. in fat transplantation, pre-op suction promotes vascularization and local growth factor release, dramatically improving fat graft survival rates, in skin/hair, microneedling works wonders through local growth factor release. Could we do the same to the nerves?