Cokluk Cengiz, Aydin Keramettin, Rakunt Cemil, Iyigun Omer, Onder Arif
Department of Neurosurgery, Ondokuzmayis University, Medical Faculty, 55139 Samsun, Turkey.
Eur Spine J. 2006 Mar;15(3):278-82. doi: 10.1007/s00586-005-0946-y. Epub 2005 Jun 21.
The odontoid process of C2 projects upward from the superior roof of the body of C2. There is a confusion about the inferior border of the odontoid. The aims of this clinical study were to describe the inferior border of the odontoid process based on the remnant of dentocentral synchondrosis in adults, and the estimation of the odontoid/body ratio in pediatric and adult ages. Sixty-six cases were included for this study. Forty-four of them were in adult ages and the remaining 22 of them were in pediatric ages. The region of occiput, C1, C2, and C3, was examined with the magnetic resonance imaging (MRI) in all cases. The length of the odontoid process was estimated by using radiological images of MR from the tip of the odontoid to the remnant of dentocentral synchondrosis. The portion located under the level of synchondrosis was considered as the body of C2. The average length of the odontoid was 18. 6 mm in pediatric and 21. 3 mm in adult cases. In adult females, the length of the odontoid process (19. 1 mm in length) was smaller than those of adult males (23. 6 mm in length). The average ratio of odontoid/body was two in pediatric and 1.8 in adult cases. This study demonstrated that the neck of the odontoid segment at the level of superior articulating facets is not the synchondrosis between the odontoid process and the body of C2. The synchondrosis is located well below the level of superior articulating facets. It can be demonstrated with sagittal and coronal images of MR in both of pediatric and adult individuals.
枢椎齿突自枢椎体上缘向上突出。关于齿突的下缘存在混淆。本临床研究的目的是基于成人齿突中央软骨结合的残余部分描述齿突的下缘，并评估儿童和成人年龄段的齿突/椎体比例。本研究纳入了66例病例。其中44例为成人，其余22例为儿童。所有病例均对枕骨、C1、C2和C3区域进行了磁共振成像（MRI）检查。通过磁共振成像的放射学图像，从齿突尖端至齿突中央软骨结合的残余部分来估计齿突的长度。位于软骨结合水平以下的部分被视为枢椎体。儿童病例中齿突的平均长度为18.6毫米，成人病例中为21.3毫米。在成年女性中，齿突的长度（19.1毫米）小于成年男性（23.6毫米）。儿童病例中齿突/椎体的平均比例为2，成人病例中为1.8。本研究表明，在关节面上方水平的齿突节段颈部并非齿突与枢椎体之间的软骨结合。该软骨结合位于关节面上方水平以下。在儿童和成人个体的磁共振矢状位和冠状位图像上均可显示。
