We have performed experiments on the survival of Coleman aspirated fat grafts. We have published these stueies in Plastic and Reconstructive Surgery and presented them at ASAPS and ASPS meetings. We believe the initial viability to be around 20-25%. Final survival is even lower.
The issue is how viability is assessed. If you look at cells grossly, the viability is high. If however you use trypan blue exclusion techniques or metabolic studies, the number of live cells from fat injection is anywhere from 3% alive to 25% alive. That is the starting number. It goes down from there as cells either survive or do not survive.
Clinically, patients complain that fat grafting does not last, but that usually some does remain. this is consistent with our findings experimentally.