I had an IAGH procedure. I had MRIs before and after all the IAGH injections showing absolutely no change in my cartilage. Dr. Dunn took before and after Xrays and he claimed the Xrays showed I had full cartilage regrowth. I later learned Xrays can be manipulated to show whatever the doctor wants them to show.
There is no clinical evidence that IAGH regrows cartilage. If there were, Dr. Dunn would be an overnight billionaire. Regrowing cartilage is the holy grail of sports medicine and Dr. Dunn hasn't found a way to do that in my opinion.