Chinese Journal Of Clinical Anatomy ›› 2015, Vol. 33 ›› Issue (3): 295-300.doi: 10.13418/j.issn.1001-165x.2015.03.014

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Computer simulation of the 3D modeling to study the best screw channel in Atlantoaxial pedicle

WANG Wei-qi1,   QIN Tao1,    WANG Ting2,    ZHENG Dong3   

  1. 1.Department of Orthopedics, People's Hospital of China Three Gorges University,Yichang, Hubei 443000, China;  2.China Three Gorges University, Yichang, Hubei 443000, China; 3.Department of Orthopedics, Union Hospital Tongji Medical College Huazhong University of Science and Technology,Wuhan 430000, China
  • Received:2014-07-01 Online:2015-05-25 Published:2015-07-24

Abstract:

 Objective    To study the regular patterns of atlantoaxial pedicle channel, screw safety zone, and the best screw channel by means of 3D-array model; To establish standards and simplify preoperative design for axis pedicle screws operation.   Methods   CT scan of axis data of 14 healthy adult from PACS system were collected and imported into Mimics10.01software to reconstruct three-dimensional (3D) models. Then, the 3D reconstruction models were imported into 3Dmax 2009 as .dwg format for analysis of the pedicle screw channels. The three-dimensional coordinates and the origin were determined, then the array model was imported.as for the atlas ,  the screw with a diameter  of 3.5 mm and  a length of  22 mm  was used as an object of study.  As for the axis, the screw with a diameter of  3.5 mm and a length of 24 mm was used as an object of study the screw placement in the safety zone was simulated and the optimal placement scheme was explored. the best placement data was recorded and was then used for guidance of computer simulation of pedicle screws.    Results    There are 185 elements that meet the demand to place the screws in the atlas, and there are 395 elements that meet the demand to place the screws in the axis. In the transparent mode, 53 nails, 27 nails in the atlas and 25 nails in the axis, all precisely gained entrance to the vertebral body through the vertebral arch pedicle. Therewas no significant difference between the left side and the right side (P> 0.05).  Conclusions    The digital 3D modeling technology is a standard, simple, accurate way in the preoperative design and measurement for axis pedicle surgery.

Key words: Atlas, Axis, 3D modeling, Pedicle screw channel, Array model