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Archives of Orthopaedic and Trauma Surgery

, Volume 132, Issue 1, pp 65–72 | Cite as

A novel computer-assisted drill guide template for thoracic pedicle screw placement: a cadaveric study

  • Tao Ma
  • Yong-Qing Xu
  • Yu-Bin Cheng
  • Mu-Yao Jiang
  • Xing-Ming Xu
  • Le Xie
  • Sheng LuEmail author
Trauma Surgery

Abstract

Introduction

The objective of this study was to develop a novel, patient-specific, navigational template for thoracic pedicle screw placement.

Methods

Twenty thoracic cadaver specimens were randomly divided into two groups of 10: the navigational template group and the free-hand group. A volumetric CT scan was performed on each thoracic vertebra, and a three-dimensional reconstruction model was generated. A drill template was designed with a surface that was the inverse of the posterior vertebral surface. Each drill template and its corresponding vertebra were manufactured using a rapid prototyping technique and tested for violation. Two hundred and forty screws were implanted into the thoracic spines and the positions of the screws were evaluated.

Results

Two hundred and forty thoracic screws were inserted using either the navigational template method or the free-hand method. The accuracy rate and incidence of risk for setting thoracic pedicle screws differed statistically between the two methods (P < 0.05): The navigational template method had a higher accuracy rate and a lower incidence of risk than the free-hand method. Moreover, the free-hand method had a significant learning curve, whereas a learning curve for the navigational template method was not obvious.

Conclusion

We have developed a novel, patient-specific, navigational template for thoracic pedicle screw placement with good applicability and high accuracy.

Keywords

Computer-aided design Rapid prototyping Individual navigational templates Thoracic spine Pedicle screws Internal fixation 

Notes

Acknowledgments

The authors would like to thank Dr Yu-Hua Cheng for his assistance with the CT data collection. This work was supported by the Yunnan Natural Science Foundation (Grant No. 2010ZC183).

Conflict of interest

None declared.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Tao Ma
    • 1
    • 2
  • Yong-Qing Xu
    • 1
  • Yu-Bin Cheng
    • 1
  • Mu-Yao Jiang
    • 1
  • Xing-Ming Xu
    • 1
  • Le Xie
    • 3
  • Sheng Lu
    • 1
    Email author
  1. 1.Orthopaedic DepartmentKunming General Hospital of Chengdu Military RegionKunmingChina
  2. 2.Third Military Medical UniversityChongqingChina
  3. 3.Department of Plasticity Forming EngineeringShanghai Jiaotong UniversityShanghaiChina

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