Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (48): 9035-9039.doi: 10.3969/j.issn.1673-8225.2011.48.026

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Anterior screw metal implant fixation of the upper thoracic spine: An anatomic study

He Ju-liang, Zhan Xin-li, Xiao Zeng-ming, Huang Shao-ming, Shen Chong, Zhou Qi, Luo Ju-li   

  1. Department of Orthopedics, the First Affiliated Hospital of Guangxi Medical University, Nanning  530021, Guangxi Zhuang Autonomous Region, China
  • Received:2011-05-17 Revised:2011-07-25 Online:2011-11-26 Published:2011-11-26
  • Contact: Zhan Xin-li, Doctor, Professor, Doctoral supervisor, Department of Orthopedics, the First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China 3cstar@163.com
  • About author:He Ju-liang☆, Studying for doctorate, Attending physician, Department of Orthopedics, the First Affiliated Hospital of Guangxi Medical University, Nanning 530021, Guangxi Zhuang Autonomous Region, China xxmchjl@yahoo.com.cn
  • Supported by:

    the National Natural Science Foundation of China, No. 30960386*; Grants of Science and Technology Department of Guangxi Zhuang Autonomous Region, No. Guikeqing 0832039*; Grants of Education Bureau of Guangxi Zhuang Autonomous Region, No. Guijiao 200710LX051*

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Abstract:

BACKGROUND: There are few reports about anatomic study addressing the anterior screw fixation of the upper thoracic spine.
OBJECTIVE: To measure the anatomy data of T1-4 segments in order to analyze the depth to insert the screw, screw length and the bending angle of the steel plate or rob for upper thoracic anterior screw fixation.
METHODS: Fifty dry specimens of T1-4 segments were used to measure the relative anatomic data, including the anterior and posterior height, upper and lower radius vector, upper and lower transverse diameter, and the smallest transverse diameter. Fifty center anteroposterior axial MRI photographs of the upper thoracic spine of normal native adults were used to measure the Cobb’s angle by electronic conimeter, and T1 and T4 was considered as the vertebral end.
RESULTS AND CONCLUSION: All of the posterior height of the upper thoracic vertebral body was higher than the anterior height of the vertebral body. So the physiological concave bending of the upper thoracic spine was maintained. Because of the inclination, the depth and the length of the screw should be bigger than the upper and lower antero-posterior diameter of the right vertebral body. We should refer to the smallest transverse diameter of vertebral body to select the suitable length and depth screw in latero-anterior fixation of the upper thoracic spine. The Cobb’s angle on the anteroposterior axial MRI photographs of the upper thoracic spine was (7.20±2.04)°. We should bend the steel plate or rob to a suitable concave angle before the fixation in the surgery.

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