Ogden J A, Murphy M J, Southwick W O, Ogden D A
Skeletal Radiol. 1986;15(6):433-8. doi: 10.1007/BF00355100.
Composites of C1 and C2 were analyzed in various roentgenographic projections to elucidate osseous interrelationships and the effect of overlap of different portions of these two vertebrae in standard radiographic projections during differing stages of postnatal chondro-osseous transformation. In anteroposterior projections the dentocentral synchrondroses of C2 normally was located below the inferior rim of the C1 anterior ossification center. The upper extent of the dens ossification center was behind this anterior C1 center. The overlap made visualization of the ossiculum terminale difficult. The spinous process of C1 could be confused with the ossiculum. In transverse projections, the normal laxity characteristic of young children allowed considerable variation in rotational interrelationships. Various degrees of such instability are illustrated. In lateral views variation of the anterior contour of the dens was significant. Such variation must be considered developmental due to the location and direction of growth of the chondrum terminale and interactive modeling between C1 and C2 to allow extension at this particular joint.
对C1和C2复合体进行了各种X线投影分析，以阐明骨的相互关系，以及在出生后软骨-骨转化的不同阶段，这两个椎体不同部分在标准X线投影中的重叠效应。在前后位投影中，C2的齿突中央软骨联合通常位于C1前骨化中心下缘的下方。齿突骨化中心的上缘位于C1前中心的后方。这种重叠使得终末小骨难以显示。C1的棘突可能与终末小骨混淆。在横断位投影中，幼儿正常的松弛特性使得旋转相互关系有相当大的变化。文中展示了不同程度的这种不稳定性。在侧位片上，齿突前缘轮廓的变化很明显。由于终末软骨的生长位置和方向以及C1和C2之间的相互作用建模，使得该特定关节能够伸展，所以这种变化必须被认为是发育性的。
