Computer-assisted quantitative measurements by three-dimensional images on zygomatic fracture deformities.
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.
He
D M
DM
Department of Oral and Maxillofacial Surgery, Peking University School of Stomatology, Beijing 100081, P.R. China.
Zhang
Y
Y
Zhang
Z K
ZK
D000293:Adolescent; D000328:Adult; D002508:Cephalometry; D005260:Female; D018460:Fractures, Comminuted / Q000145:classification / Q000000981:diagnostic imaging; D005624:Frontal Bone / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D021621:Imaging, Three-Dimensional / Q000379:methods; D004204:Joint Dislocations / Q000145:classification / Q000000981:diagnostic imaging; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging; D008875:Middle Aged; D009915:Orbit / Q000000981:diagnostic imaging; D015203:Reproducibility of Results; D013701:Temporal Bone / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*; D015050:Zygoma / Q000000981:diagnostic imaging; D015051:Zygomatic Fractures / Q000145:classification / Q000000981:diagnostic imaging*