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Accuracy and efficacy of thoracic pedicle screws in scoliosis with patient-specific drill template

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Abstract

With the rapid increase in the use of thoracic pedicle screws in scoliosis, accurate and safe placement of screw within the pedicle is a crucial step during the scoliosis surgery. To make thoracic pedicle screw placement safer various techniques are used, Patient-specific drill template with pre-planned trajectory has been thought as a promising solution, it is critical to assess the efficacy, safety profile with this technique. In this paper, we develop and validate the accuracy and safety of thoracic transpedicular screw placement with patient-specific drill template technique in scoliosis. Patients with scoliosis requiring instrumentation were recruited. Volumetric CT scan was performed on each desired thoracic vertebra and a 3-D reconstruction model was generated from the CT scan data. The optimal screw size and orientation were determined and a drill template was designed with a surface that is the inverse of the posterior vertebral surface. The drill template and its corresponding vertebra were manufactured using rapid prototyping technique and tested for violations. The navigational template was sterilized and used intraoperatively to assist with the placement of thoracic screws. After surgery, the positions of the pedicle screws were evaluated using CT scan and graded for validation. This method showed its ability to customize the placement and the size of each pedicle screw based on the unique morphology of the thoracic vertebra. In all the cases, it was relatively very easy to manually place the drill template on the lamina of the vertebral body during the surgery. This method significantly reduces the operation time and radiation exposure for the members of the surgical team, making it a practical, simple and safe method. The potential use of such a navigational template to insert thoracic pedicle screws in scoliosis is promising. The use of surgical navigation system successfully reduced the perforation rate and insertion angle errors, demonstrating the clear advantage in safe and accurate pedicle screw placement of scoliosis surgery.

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Acknowledgments

The authors would like to thank Dr. You-hua Cheng for his assistance with the CT data collection. This work was supported by Yunnan Natural Science Foundation (2010ZC183 and 2011CA015).

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Authors and Affiliations

  1. Department of Orthopedics, Kunming General Hospital, PLA, Daguan Road, Kunming, China

    Sheng Lu, Ji H. Shi, Yu B. Chen, Xing M. Xu & Yong Q. Xu

  2. Department of Orthopedics, The First Hospital Affiliated to the Inner Mongolia Medical College, Inner Mongolia Autonomous Region, Hohhot, China

    Yuan Z. Zhang

  3. Department of Orthopedics, General Hospital of PLA, Beijing, China

    Zheng Wang

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  1. Sheng Lu
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  2. Yuan Z. Zhang
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  3. Zheng Wang
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  4. Ji H. Shi
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  7. Yong Q. Xu
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Correspondence to Yong Q. Xu.

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Lu, S., Zhang, Y.Z., Wang, Z. et al. Accuracy and efficacy of thoracic pedicle screws in scoliosis with patient-specific drill template. Med Biol Eng Comput 50, 751–758 (2012). https://doi.org/10.1007/s11517-012-0900-1

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  • DOI: https://doi.org/10.1007/s11517-012-0900-1

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