Anatomic and radiological study on posterior pedicle screw fixation in the atlantoaxial vertebrae of children

• Published in: Chinese journal of traumatology Vol. 13; no. 4; pp. 229 - 233
• Main Author: 邓雄伟 闵志海 林斌 张发惠
• Format: Journal Article
• Language: English
• Published: China Elsevier B.V 01.08.2010; Department of Orthopaedics, Third Hospital of Nanchang, Nanchang 330000, China%Department of Orthopaedics, 175th Hospital of PLA,Zhangzhou 363000, China%Clinical Anatomy Research Center, Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350000,China
• Subjects: Anatomy; Axis; Axis, Cervical Vertebra - anatomy & histology; Axis, Cervical Vertebra - diagnostic imaging; Axis, Cervical Vertebra - surgery; Bone Screws; Cervical atlas; Cervical Atlas - anatomy & histology; Cervical Atlas - diagnostic imaging; Cervical Atlas - surgery; Child; CT扫描; Humans; Radiography; Radiology; 儿童; 宽度测量; 放射性; 枢椎; 椎弓根螺钉; 解剖; 计算机断层扫描; Radiology; Bone screws; Cervical atlas; Anatomy; Child; Axis
• ISSN: 1008-1275
• DOI: 10.3760/cma.j.issn.1008-1275.2010.04.007

Objective： To investigate the feasibility of posterior fixation with 3.5-mm pedicle screws in the atlantoaxial vertebrae of children. Methods： In this study, atlantoaxial vertebrae specimens were obtained from 10 cadavers of children aged 6-8 years. We measured the height and width of the C1 pedicle and the midportion of C1 lateral mass; the width of C1 posterior arch under the vertebral artery groove and the height of the external and internal one-third of this part; the external, internal height and the superior, middle, inferior width of the C2 pedicle （transverse foramen）. Furthermore, computed tomography （CT） axial scan was performed on 20 agematched volunteers to obtain relative data of their atlantoaxial vertebrae. We measured the length and width of the C1 and C2 pedicles in the atlantoaxial cross-sectional plane. On CT workstation, we also measured the angles between the longitudinal axes of the atlantoaxial pedicles and the midsagittal plane. Results： For the cadaveric specimen group, the height and width of the C1 pedicle were （5.26±0.44） mm and （6.26±0.75） mm respectively. The height of the medial one-third of the Ct posterior arch under the vertebral artery groove was （4.07±0.24） mm. The external, internal height and superior, middle, inferior width of the C2 pedicle was （6.86±0.48） mm, （6.67±0.49） mm, （6.63 ±0.61） mm, （5.41±0.39） mm and （3.71±0.30） mm, respectively. For the volunteer group measured by CT scan, the height and width of the C1 pedicle were （5.47 ±0.34） mm and （6.63±0.54） mm respectively, while （6.59±0.51） mm and （5.13 ±0.42） mm of the C2 pedicle. The angles between the atlas, axis pedicles and the midsagittal plane were （9.60±1.32）° and （27.80±2.22）° respectively. Conclusion： It is feasible to place a 3.5-mm pedicle screw in the C1 and C2 pedicles of children aged 6-8 years old.