Hashemi S, Oda M, Onoue K, et al. - Researchers conducted this retrospective chart review to define the maximum gap-size criteria for osseous union to occur at osteotomy sites in fibula free flap reconstruction of the mandible. Participants in the study were patients who had fibula free flap surgery and had imaging of the mandible at < 3 months and > 6 months after surgery. Thirty-eight osteotomy sites from 13 individuals were analyzed, and a total of 190 measurements were made. In this study, a mean osteotomy gap size of 1.31 mm has been achieved with an osseous union. The data suggest that distances between ossesous segments > 2 mm are associated with an increased risk of non-union. The authors believe that the information from this study will help to increase current and future techniques in the field of mandible reconstruction.