Outfracturing the sunken nasal bones?

While rare, this complication of collapse of the nasal bones can occur. Without being present during the case, it's impossible for me to say exactly why this occurred in your case: thin bones, poor fracture propagation, overly agressive osteotomies, etc. Fortunately, it is often possible to correct it with outfracturing, much like fixing someone's broken nose. It can require more advanced techniques if simple outfracturing and splinting didn't work, but that's unusual. By the way, any very minor final contour irregularities that are not affecting nasal breathing can often be camouflaged with in-office fillers.All the best,
--DCP
Pearson Facial Plastic Surgery®

It is possible that the nasal bones might have been in-fractured too aggressively. Out fracturing them and putting nasal packing internally may help to reposition them.

A revision rhinoplasty is more difficult that a primary rhinoplasty, so its important to choose your surgeon wisely based on extensive experience. The nasal bones can be out fractured to a  wider position, and then can be held in place with spreader grafts.  The spreader grafts are harvested from inside the nose, provided there's cartage left over after the primary  rhinoplasty.