Abstract: Objective: To explore the diagnostic value of spiral CT three-dimensional reconstruction and magnetic resonance imaging (MRI) in the fracture of mandibular condyle. Methods: Sixty-nine cases of suspected condylar fracture that treated in our hospital were selected. All patients were detected by three dimensional spiral CT and MRI. The type, displacement, and soft tissue injury of the condylar fracture were observed. The intraoperative diagnosis was used as the gold standard of assessment. The diagnostic efficacy of CT and MRI in the diagnosis of condylar fracture type, displacement type, and soft tissue injury was compared. Results: CT detection showed that Ⅰ class fracture was 65.22%, Ⅱ class fracture was 21.74%, and Ⅲ class fracture was 13.04%. MRI test results showed that Ⅰ class fractures accounted for 71.01%, Ⅱ class fractures accounted for 17.39%, and Ⅲ type fractures accounted for 11.59%. CT detection showed the types of condylar fracture displacement type Ⅰ was 39.13%, type Ⅱ was 28.99%, and type Ⅲ was31.88%. MRI showed type Ⅰ was 36.23%, type Ⅱ was 26.09%, and type Ⅲ was 37.68%. There was no significant difference between the type of fracture and the type of displacement between CT and MRI. The detection rate of MRI in bone marrow edema was significantly higher than that of CT (P<0.05). Taken the operative diagnosis as the gold standard, the accuracy, sensitivity, and specificity of MRI in the detection of bone marrow edema were significantly higher than that of CT (P<0.05). Conclusion: The accuracy of CT and MRI in detecting the types of condylar fracture and fracture displacement types is similar. MRI can also effectively respond to intraarticular capsule injury in patients, and can be used to detect the soft tissue injury of the mandibular condylar fracture.

Key words: Mandibular condyle fracture, Three dimensional reconstruction of spiral CT, Nuclear magnetic resonance, Type of fracture Fracture, displacement Diagnostic efficiency