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Computer-assisted quantitative measurements by three-dimensional images on zygomatic fracture deformities
1Department of Oral and Maxillofacial Surgery, Peking University School of Stomatology, Beijing 100081, P.R. China.
Objective:
To investigate an available method for quantitative diagnosis of zygomatic fractures that allow quantitative classification and diagnosis.
Methods:
The radiographs and 2- and 3-dimensional CT images of 57 patients with zygomatic fractures were measured and analyzed by a computer-assisted measuring system before and after treatment. This was used to diagnose the displacement and deformity of the fractures.
Results:
(1) Using anthropology points and a computer-assisted measuring system, a new method was established to assess the displacement of the zygomatic fractures. (2) Displacement of the zygomatic fractures was approximately diagnosed by measuring different angles of the CT images. (3) A new classification was proposed based on the deformities of the zygomatic fractures: Type A, zygomatic body was intact and not displaced; Type B, zygomatic body was intact but displaced (including comminuted zygomatic arch fractures); Type C, zygomatic body was comminuted and displaced. (4) There were 4 subtypes with characteristics in the most common Type B fractures. (5) Different images had different advantages for diagnosing zygomatic fractures.
Conclusions:
(1) Displacement of the zygomatic fractures can be quantitatively diagnosed by measuring 3-D CT images. (2) The computer-assisted 3-D CT measuring system is accurate, reliable, and clinically feasible for diagnosing zygomatic fractures. (3) The best image to diagnose the displacement of the fractures should be used.
