Zygomatic bone fractures cause zygomatic facial collapse. The zygomatic bone and zygomatic arch are the more prominent parts of the face and are susceptible to fracture due to impact. The zygomatic bone is associated with the maxilla, the frontal bone, the pterygoid bone, and the temporal bone, with the maxilla having the largest surface of association, so zygomatic bone fractures are often accompanied by maxillary fractures. The temporal eminence of the zygomatic bone connects with the zygomatic eminence of the temporal bone to form the zygomatic arch, which is thin and narrow and more prone to fracture. Etiology The disease is mainly caused by external violence. Since the zygomatic bone and zygomatic arch are the more prominent parts of the face, they are prone to fracture due to collision, trauma and other violence. Zygomatic arch fracture can be diagnosed based on the history of injury, clinical features and X-ray examination. Palpation of the fracture may be localized with tenderness, collapse and displacement, and steps may be formed at the zygomaticofrontal suture, the zygomaticomandibular suture, and the infraorbital rim. If palpation is made from the mouth along the vestibular sulcus to the upper back, the space between the zygomatic bone and the maxilla and the rostral process can be examined to see if it becomes smaller. These can help in the diagnosis of zygomatic fracture. Radiographs are often taken in the nose-chin position and the zygomatic arch position. In the nasal-chin position, not only can the fracture of the zygoma and zygomatic arch be seen, but also the structures of the orbit, maxillary sinus and infraorbital foramen can be observed for any abnormalities. In the zygomatic arch position, the fracture and displacement of the zygomatic arch can be clearly shown.