Abstract
Three hundred zygomatic bone fracture cases involving infraorbital neuropathy treated at our hospital were investigated in detail. In comparison with past literature, the morbidity ratio of Knight & North classification, the sex ratio, the laterality and the operation ratio were the same. We divided the zygomatic bone fracture types into two groups classified by fracture line intersecting infraorbital foramen, an intersecting group A and a non-intersecting group B; it became clear that both groups showed no significant difference (47.7% vs 52.3% P = 0.453 Fisher's exact test). Infraorbital neuropathy incidence ratio was calculated and group A was significantly different (74.1% vs 38.9% P = 0.000 Fisher's exact test). Furthermore, the infraorbital neuropathy improvement ratio was calculated and did not show a significant difference between groups A and B (68.9% vs 70.5% P = 0.826 Fisher's exact test). The incidence ratio of infraorbital neuropathy, especially that of group B (38.9%), indicate the need for further study concerning an inspection and operative plan for the zygomatic region.
