PURPOSE Because of the complex cervical vertebral embryology and some normal variations, the atlantoadental interval (ADI) was not suitable for the evaluation of the anatomic relationship between the atlas and axial in children less than 2 years old. And the influence of the age and gender on the anatomic relationship between atlas and axial in children was still unclear. Two novel parameters, atlas-axis anteroposterior distance (AAAD) and atlas-axis lateral distance (AALD), were invented to evaluate the anatomic relationship between the atlas and axis in the children no more than 8 years old with different age and gender. METHODS Cross-sectional computed tomography (CT) scans of the atlantoaxial joint for 140 randomly selected pediatric patients no more than 8 years old were analyzed. On the ideal CT reconstruction images, AAAD, AALD, atlantoaxial lateral bending angle (AALB), and atlantoaxial rotation angle (AARA) were measured. RESULTS There was no statistically significant difference between the mean AAAD in different age and gender groups. The 99% confidence interval for AAAD was 7.12-7.82 mm. There was no significant correlation between AAAD and AALB/AARA and AALD and AALB/AARA. CONCLUSION The AAAD was less than 7.12 mm or much than 7.82 mm that suggested a possible instability in the atlantoaxial joint and could help the diagnosis of the atlantoaxial instability in children no more than 8 years old. There was no difference between the mean AAAD of pediatric patients no more than 8 years old in different age and gender groups.

中文翻译：

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评估年龄和性别对不超过8岁儿童的图谱和轴的解剖关系的影响的两个新参数：影像学研究。

目的由于复杂的颈椎胚胎学和一些正常的变化，因此不适合评估2岁以下儿童的寰枢椎和寰枢椎之间的解剖关系。年龄和性别对儿童寰椎和寰椎解剖关系的影响尚不清楚。发明了两个新颖的参数，寰枢轴前后距离（AAAD）和寰枢轴侧向距离（AALD），以评估年龄和性别不同的8岁以下儿童寰枢轴之间的解剖关系。方法对140名年龄不超过8岁的随机选择的儿科患者的寰枢关节进行断层计算机断层扫描（CT）扫描。在理想的CT重建图像上，AAAD，AALD，测量了寰枢椎侧弯角（AALB）和寰枢椎旋转角（AARA）。结果不同年龄和性别组的平均AAAD差异均无统计学意义。AAAD的99％置信区间为7.12-7.82毫米。AAAD和AALB / AARA以及AALD和AALB / AARA之间没有显着相关性。结论AAAD小于7.12 mm或大于7.82 mm，提示寰枢椎关节可能不稳定，并有助于诊断不超过8岁儿童的寰枢椎不稳定性。不同年龄和性别的不超过8岁的小儿患者的平均AAAD之间没有差异。结果不同年龄和性别组的平均AAAD差异均无统计学意义。AAAD的99％置信区间为7.12-7.82毫米。AAAD和AALB / AARA以及AALD和AALB / AARA之间没有显着相关性。结论AAAD小于7.12 mm或大于7.82 mm，提示寰枢椎关节可能不稳定，并有助于诊断不超过8岁儿童的寰枢椎不稳定性。不同年龄和性别的不超过8岁的小儿患者的平均AAAD之间没有差异。结果不同年龄和性别组的平均AAAD差异均无统计学意义。AAAD的99％置信区间为7.12-7.82毫米。AAAD和AALB / AARA以及AALD和AALB / AARA之间没有显着相关性。结论AAAD小于7.12 mm或大于7.82 mm，提示寰枢椎关节可能不稳定，并有助于诊断不超过8岁儿童的寰枢椎不稳定性。不同年龄和性别的不超过8岁的小儿患者的平均AAAD之间没有差异。12毫米或比7.82毫米大得多，这表明可能在寰枢椎关节中出现不稳定性，并且可以帮助诊断不超过8岁儿童的寰枢椎不稳定性。不同年龄和性别的不超过8岁的小儿患者的平均AAAD之间没有差异。12毫米或比7.82毫米大，表明可能存在寰枢关节不稳定性，并且可以帮助诊断不超过8岁儿童的寰枢关节不稳定性。不同年龄和性别的不超过8岁的小儿患者的平均AAAD之间没有差异。