| Objective: Research the imaging information of the Normal population and patients with atlantoaxial subluxation,measured every bony landmark,found the difference between the normal population and the definite case of atlantoaxial subluxation.Methods: Collected and analyzed patients with atlantoaxial subluxation in Affiliated Hospital of Qingdao University from February 2007 to February 2014 due to cervical spine trauma retrospectively. Fifty–two patients( 27 men, 25 women,age range: 17-62, mean age: 39) were included into the study. The examination was occurred 3h ~ 0.5a after trauma, average 36.8d. In addition, 230 cases of healthy volunteers were included into the study, aged 18 to 60 years, mean 41. The criteria for the subjects were no history of head and neck surgery, trauma and related history and other abnormal atlantoaxial joint disease, like medical pillow neck, shoulder area no tenderness, no malformations and degeneration hyperplasia. MPR reconstruction group were obtained with the original image which were sent to the workstation, then we measured the Atlanto Dental Interval(ADI) and the Lateral Atlanto-dental Space(LADS). To reduce the measurement error operation, all patients by the same person repeated three times and averaged as the final results of the analysis.Results:(1) The ADI of 230 cases in the normal group were in the normal range(<2-3mm), 49 cases in the case group were in the abnormal range( > 3mm), 3 cases were 2-3mm. There was significant difference between the two groups by T test.(2) Dens normal bilateral lateral mass asymmetry gap 204 cases, 26 cases symmetrical, asymmetrical case group 50 cases, 2 cases of symmetry. There was no correlation between normall group and study group by X2 test.Conclusion: Asymrnetry of bilateral LADS can not be diagnosed atlanto-axial joint subluxation, the ADI is atlantoaxial subluxation imaging diagnosis more accurate indicator.Clinical manifestations and other imaging findings should be evaluated to make a diagnosis. |
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