Microvascular reconstruction of midface osteoradionecrosis.

[BACKGROUND] Head and neck osteoradionecrosis (ORN) of the midface requiring free flap (FF) reconstruction is uncommon. This multi-institutional study was designed to review outcomes for this rare patient population.

[METHODS] Retrospective multi-institutional review of FF reconstruction for midface ORN (2005-2022; n = 54).

[RESULTS] The FF survival rate was 87% (n = 54). Patients were less likely to be tolerating a regular diet at 3 months postoperative if they had a preoperative history of prior head and surgery (80% vs. 95%; p = 0.02), a pathologic fracture (50% vs. 90%; p = 0.04), exposed bone intraorally (43% vs. 94%; p = 0.002), or a fistula (67% vs. 96%; p = 0.03). Mean albumin was higher in patients whose FF survived (3.6 ± 0.5 vs. 2.7 ± 1.4; p = 0.03). Patients with low prealbumin were more likely to undergo a hematoma evacuation (27% vs. 0%; p = 0.02).

[CONCLUSION] In this series of midface ORN requiring FF reconstruction preoperative nutritional status impacted postoperative complications. Preoperative occurrence of a fistula, pathologic fracture, and intraoral bone exposure correlated with decreased tolerance of a regular diet following reconstruction.