Tian Man-man, Lin Min, Qian Qi, Jiang Huang-wei
Zhongguo Gu Shang. 2015 Oct;28(10):915-9.
To provide quantitative foundation for the diagnosis of atlanto-axial rotatory subluxation by analyzing the various imaging features of normal atlanto-axial joints in neutral position and rotary functional position on the MSCT images.
Forty-one normal volunteers were examined by CT on the atlanto-axial joint in neutral position and rotary functional position. By the observation and measurement of atlanto-dental interval (ADI), lateral atlanta-dental space (LADS), VBLADS and rotating angle of atlas on dentate (RAAD), the imaging manifestations and anatomical characteristics were analyzed and compared. In order to compare VBLADS and RAAD and make a correlation analysis between different age groups, 51 normal volunteers were divided into two groups: age younger than 45 years old group and age older than or equal to 45 years old group.
The dens in neutral position deviated in an angle range of (3.22±0.89)°. The articular facets of lateral atlantoaxial joint in rotary functional position had rotatory displacement and the range of the relative rotation angle was (33.85± 2.79)°. Through the correlation analysis of matching data, it could be concluded that there was no correlation between atlantoaxial relative rotation angle and VBLADS within a certain range. There were statistically differences of atlantoaxial relative rotation angle in rotary functional position between two groups.
MSCT imaging in rotary functional position can clearly show the anatomical structure and rotation function of a normal atlanto-axial joint, so as to provide a theoretical basis for the diagnosis of atlanto axial rotatory subluxation.
通过分析正常寰枢关节在中立位和旋转功能位的多层螺旋CT（MSCT）图像的各种影像学特征，为寰枢椎旋转半脱位的诊断提供定量依据。
对41名正常志愿者的寰枢关节在中立位和旋转功能位进行CT检查。通过观察和测量寰齿间距（ADI）、寰椎侧方齿突间隙（LADS）、椎体后缘至齿突侧方间隙（VBLADS）以及寰椎相对于齿突的旋转角度（RAAD），分析并比较其影像学表现和解剖学特征。为比较VBLADS和RAAD并对不同年龄组进行相关性分析，将51名正常志愿者分为两组：年龄小于45岁组和年龄大于或等于45岁组。
中立位时齿突偏移角度范围为（3.22±0.89）°。旋转功能位时寰枢外侧关节面有旋转移位，相对旋转角度范围为（33.85±2.79）°。通过对匹配数据的相关性分析可知，在一定范围内寰枢相对旋转角度与VBLADS之间无相关性。两组在旋转功能位时寰枢相对旋转角度存在统计学差异。
旋转功能位的MSCT成像能够清晰显示正常寰枢关节的解剖结构和旋转功能，从而为寰枢椎旋转半脱位的诊断提供理论依据。
