Revision of Rib Graft Rhinoplasty
The rib graft can be modified/reduced as soon as one is certain that they are looking at the final result and are sure they really want it reduced. As a general statement, three months after surgery would be reasonable to undergo the change.
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You did not mention how long it has been since your rib graft. If recent, then swelling can contribute to the overall size. You should give it about a year.
Revision rhinoplasty after in graft.
Revision rhinoplasty after in graft can be done in 6-12 months depending on what else needs to be done to the nose. See a very experienced revision rhinoplasty surgeon!
Revision rhinoplasty with rib cartilage grafts
How long has it been since surgery? Rib cartilage can get re-absorbed by your body with time (usually about 20-30%). Swelling also occurs after surgery. These two factors would make it wise in my mind to wait at least a year before revisiting surgery. Your surgeon needs to be able to assess your nose adequately before making any decisions to remove the grafts.