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

ObjectiveTo investigate the feasibility of posterior fixation with 3.5-mm pedicle screws in the atlantoaxial vertebrae of children.MethodsIn 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 C 2 pedicle (transverse foramen). Furthermore, computed tomography (CT) axial scan was performed on 20 age-matched volunteers to obtain relative data of their atlanto-axial vertebrae. We measured the length and width of the C 1 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 mid-sagittal plane.ResultsFor 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 C1 posterior arch under the vertebral artery groove was (4.07±0.24) mm. The external, internal height and superior, middle, inferior width of the C 2 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 C 2 pedic le. The angles between the atlas, axis pedicles and the midsagittal plane were (9.60±1.32)° and (27.80±2.22)° respectively .ConclusionIt is feasible to place a 3.5-mm pedicle screw in the C1 and C2 pedicles of children aged 6–8 years old.