Chinese Journal of Tissue Engineering Research ›› 2015, Vol. 19 ›› Issue (35): 5723-5727.doi: 10.3969/j.issn.2095-4344.2015.35.027

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Characteristics of lower lumbar pedicle screw angle in Chinese population using digital technology

Wang Hai-zhou, Li Hong-wei, Wang Shuang, Ji Nan, Wang Shuai   

  1. Department of Orthopedics, People’s Liberation Army No. 202 Hospital, Shenyang 110003, Liaoning Province, China
  • Received:2015-08-01 Online:2015-08-27 Published:2015-08-27
  • Contact: Li Hong-wei, Chief physician, Master’s supervisor, Department of Orthopedics, People’s Liberation Army No. 202 Hospital, Shenyang 110003, Liaoning Province, China
  • About author:Wang Hai-zhou, Associate chief physician, Department of Orthopedics, People’s Liberation Army No. 202 Hospital, Shenyang 110003, Liaoning Province, China Wang Shuang, Master, Attending physician, Department of Orthopedics, People’s Liberation Army No. 202 Hospital, Shenyang 110003, Liaoning Province, China Wang Hai-zhou and Wang Shuang contributed equally to this article.
  • Supported by:

    the People’s Liberation Army No. 202 Hospital Project, No. 2013K14

Abstract:

BACKGROUND: Pedicle screw fixation is the mainstream type of spine operation currently. The key point of the fixation is to make the screw pass through the center of pedicle. The angle of pedicle screw implantation is a key factor for repair quality. In previous literatures, angle of pedicle screw is determined according to the patient body, and is easily disturbed by factors such as position of the body. 
OBJECTIVE: To determine the inserting angle of pedicle screw of lower lumbar spine taking local anatomic landmark as a reference using digital technology.
METHODS: 3D-CT data of 100 patients were selected. The fourth and fifth lumbar vertebrae received three-dimensional reconstruction, and the operation was simulated using digital technology to achieve optimal placement. After simulation, the angle of pedicle screw was measured. The angle of the planes of the midline of the screw and the midline of the spine served as coronal angle. The angle of the planes of the midline of the screw and the upper surface of the vertebral body served as sagittal angle. 
RESULTS AND CONCLUSION: Measure results suggest that each angle was bigger than the angle in previous studies, which might be induced by different reference markers. Standard deviation of each angle was also big. These findings verify that the anatomical differences of pedicles were apparent. Thus, we should insert the 
pedicle screws individually. Method of locating reference using anatomic landmarks of a single vertebral body can maximize to avoid interference posture. The combination with preoperative three-dimensional reconstruction is more in line with the requirements of pedicle screw, and can effectively improve the accuracy of pedicle screws.

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: Spine, Lumbar Vertebrae, Bone Nails, Imaging, Three-Dimensional, Internal Fixators

CLC Number: