RADIOGRAPHIC ALIGNMENT OF CERVICAL SPINE ON A SAMPLE OF ASYMPTOMATIC SUBJECTS

ABSTRACT Objective: To present normality parameters for the cervical spine in a sample of the Brazilian population and its distribution by sex and age. Methods: This was a prospective study considering 94 asymptomatic individuals evaluated by panoramic radiograph of the spine for the analysis of the following parameters: cervical lordosis (CL), C2 sagittal vertical axis (SVA-C2), cervical sagittal vertical axis (cSVA), and T1 Slope (TA-T1). The parameter values were compared according to sex and age of individuals. Results: The mean CL was -16.5° (SD: ± 10.8°), SVA-C2 was -3.9 mm (SD: ± 29.2 mm), cSVA was 16.9 mm (SD: ± 10.6 mm) and TA-T1 was 24.8° (SD: ± 7.0°). There was no significant difference between the radiographic parameters when considered with respect to sex and age of individuals (P>0.05). The analysis of correlation among the radiographic parameters showed that the TA-T1 presented the highest correlation with the other parameters, including CL (r= 0.367, P<0.01), SVA-C2 (r= 0.434, P<0.001) and cSVA (r= 0.441, P<0.001). There was also a correlation between SVA-C2 and cSVA (r= 0.32, P= 0.001) and inverse correlation between CL and the cSVA (r= -0.242, P= 0.019). Conclusio: We introduced normality data of the cervical spine alignment in a Brazilian population sample. There was significant correlation among the analyzed parameters, especially considering TA-T1 in relation to the other parameters.

摘要
研究目的：本研究旨在获取巴西人群颈椎的正常参数，并分析其按性别与年龄的分布特征。
方法：本研究为前瞻性研究，纳入94名无症状受试者，通过脊柱全景X线片对以下参数进行分析：颈椎前凸角（cervical lordosis, CL）、C2矢状垂直轴（sagittal vertical axis-C2, SVA-C2）、颈椎矢状垂直轴（cervical sagittal vertical axis, cSVA）以及T1倾斜角（T1 Slope, TA-T1）。根据受试者的性别与年龄对各参数值进行比较分析。
结果：本研究测得各参数的平均值分别为：CL为-16.5°（标准差SD：±10.8°），SVA-C2为-3.9mm（SD：±29.2mm），cSVA为16.9mm（SD：±10.6mm），TA-T1为24.8°（SD：±7.0°）。按性别与年龄分组对比各影像学参数，均未发现显著组间差异（P>0.05）。对各影像学参数间的相关性分析显示，TA-T1与其余参数的相关性最高，其中与CL的相关系数r=0.367（P<0.01），与SVA-C2的相关系数r=0.434（P<0.001），与cSVA的相关系数r=0.441（P<0.001）。此外，SVA-C2与cSVA亦存在显著相关性（r=0.32，P=0.001），而CL与cSVA呈负相关（r=-0.242，P=0.019）。
结论：本研究建立了巴西人群颈椎序列的正常参考数据。各分析参数间存在显著相关性，其中TA-T1与其余参数的相关性尤为突出。