Digital screw path analog measurement of C4-6 posterior fixation parameters in adolescents aged 12-14 years and its clinical significance

doi:10.3969/j.issn.2095-4344.0044

Abstract

Abstract:

BACKGROUND: For recent decades, there has been a younger tendency in age of occurrence of the cervical spondylosis, and posterior fusion is the main method for cervical degeneration and injury, but no relevant fixation parameters are available in clinical practice for adolescents.

OBJECTIVE: To measure the anatomical parameters of C₄_-₆ posterior fixation in the adolescents aged 12-14 years after three-dimensional reconstruction.

METHODS: Twenty-one adolescents aged 12-14 years, who underwent cervical examination at the Affiliated Hospital of Inner Mongolia Medical University and Department of Orthopedics of the Second Hospital of Ulanqab between January 2014 and December 2016 were randomly selected, and the CT data of the C₄_-₆ were collected, and then imported into Mimics16.01 software for three-dimensional reconstruction. We measured the anteroposterior and transverse diameters and the heights of the vertebral body, anteroposterior and transverse diameters of the transverse foramina, angles of the left and right pedicle axes to sagittal and horizontal axes, and left and right pedicle axis lengths.

RESULTS AND CONCLUSION: (1) Both anteroposterior and transverse diameters of the transverse foramina were increased with vertebral level incveasing. Both angles of pedicle axis to sagittal and horizontal axes, and pedicle axis lengths were increased with vertebral level. The anteroposterior diameter of the vertebral body at C₄_-₆ was in the range of 6.0-8.0 mm, the transversal diameter was in 25.0°-30.0°, the angle between the posterior screw and the horizontal axis was 29.0°-35.0°; in the sagittal plane, the angle to the sagittal axis was no more than 5°; and the pedicle screw path length was in 6-7 mm. (2) These results show the anatomical parameters of C₄_-₆ posterior fixation in the adolescents aged 12-14 years are successfully obtained by three-dimensional reconstruction.

中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Tissue Engineering, Cervical Vertebrae, Adolescent

CLC Number:

R318

Zhang Kai, Chen Xiao-xing, Zhang Hai-xia, Zhang Chuan-wei, Wang Hai-yan. Digital screw path analog measurement of C₄_-₆ posterior fixation parameters in adolescents aged 12-14 years and its clinical significance[J]. Chinese Journal of Tissue Engineering Research, 2018, 22(3): 438-443.

Figures/Tables 1

Quantitative analysis of the participants Twenty-one adolescents, aged 12-14 years, who underwent cervical examination without cervical lesions at C4-6 levels, were randomly selected. Baseline analysis All patients had no history of cervical surgery, with a mean age of 13.2 years, height: (145.45±13.67) cm, body mass: (43.54±3.54) kg. Anteroposterior and transverse diameters of the vertebral body The transverse diameter increased from (25.67 ± 0.15) mm at C4 to (30.69 ± 0.22) mm at C6, and the anteroposterior diameter increased from (5.89 ± 0.22) mm at C4 to (7.85 ± 0.34) mm at C6. There were significant differences in both diameters between segments (P < 0.05; Table 1). Measurement of the sagittal heights There were significant differences in the anterior, middle and posterior heights in the median sagittal plane from C4 (6.29 ± 0.51) mm, (6.09 ± 0.42) mm, and (6.35 ± 0.49) mm, respectively) to C6 ((8.69 ± 0.35) mm, (8.02 ± 0.55) mm, and (8.04 ± 0.20) mm, respectively) between segments (P < 0.05). In other words, the anterior, middle and posterior sagittal heights increased with vertebral level (Table 2). Measurement of the anteroposterior and transverse diameters of the transverse foramina Both anteroposterior and transverse diameters of the transverse foramina increased with vertebral level. There was no significant difference in both anteroposterior and transverse diameters between the opposing transverse foramen of the same vertebrae (P > 0.05). Both anteroposterior and transverse diameters of the transverse foramina showed significant differences between segments (P < 0.05) (Table 3). Angles of left and right pedicle axes to sagittal and horizontal axes, and left and right pedicle axis lengths There was no significant difference in the angles of pedicle axis to sagittal and horizontal axes, and pedicle axis length between sides (P > 0.05). Both the angles of pedicle axis to sagittal and horizontal axes, and pedicle axis length increased significantly with vertebral level (P < 0.05) (Tables 4-6). "

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Digital screw path analog measurement of C₄_-₆ posterior fixation parameters in adolescents aged 12-14 years and its clinical significance

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