It's a little unusual for the fat to be completely gone in 7 weeks. Probably the swelling, which can be significant, is gone and it looks less volumized by comparison. However, fat grafting is very technique oriented. When done by someone experienced, the survival can be up to 70-80%. Fat must be harvested very tediously, prepared carefully and by specifically nd then inbjected by the smallest of amounts (like micro-droplets). Fat grafts must be small enough to aquire a blood supply fo rit to survive, and the smaller grafts have a much better chance. Then the post operative swelling can be extreme for several weeks.
I have seen patients that have had fat grafts and virtually none survived and others who had faces much too full. One thing to keep in mind is that if the grafts are taken from the abdomen and the patient gains weight, the face can get very fat. Removing excess fat can be challenging.
E. Ronald Finger, MD
Savannah Plastic Surgeon