veterinary stem cell therapy

Autologous ("your own") stem cell therapy is currently available for dogs and horses for orthopedic conditions, and is being explored for use in other disease modalities such as liver failure.  The process involves taking a small amount of the animal's own fat, having it processed in a lab, and injecting the resulting stem cells into the affected joint.  It certainly isn't a fountain of youth, but the results are good in most of the animals treated.  It seems to be a practical, ethical path to healthier joints and perhaps can  impact other disease states.  What is the current state of autologous stem cell therapy in humans?