Asian Spine J.  2017 Feb;11(1):4-14. 10.4184/asj.2017.11.1.4.

A Novel Patient-Specific Drill Guide Template for Pedicle Screw Insertion into the Subaxial Cervical Spine Utilizing Stereolithographic Modelling: An In Vitro Study

• Bundoc RC
• Delgado GD
• Grozman SA

• KMID: 2391579
• DOI: http://doi.org/10.4184/asj.2017.11.1.4

Abstract

STUDY DESIGN: Cadaveric study. PURPOSE: The purpose of this study was to assess the accuracy and feasibility of cervical pedicle screw (CPS) insertion into the subaxial cervical spine placed using a patient-specific drill guide template constructed from a stereolithographic model. OVERVIEW OF LITERATURE: CPS fixation is an invaluable tool for posterior cervical fixation because of its biomechanical advantages. The major drawback is its narrow corridor that allows very little clearance for neural and vascular injuries.
METHODS
Fifty subaxial pedicles of the cervical vertebrae from five cadavers were scanned into thin slices using computed tomography (CT). Digital imaging and communications in medicine images of the cadaver spine were digitally processed and printed to scale as a three-dimensional (3D) model. Drill guide templates were manually moulded over the 3D-printed models incorporating pins inserted in the pedicles. The drill guide templates were used for precise placement of the drill holes in the pedicles of cadaveric specimens for pedicle screw fixation.
RESULTS
The instrumented cadaveric spines were subjected to CT to assess the accuracy of our pedicle placement by an external observer. Our patient-specific drill guide template had an accuracy of 94%.
CONCLUSIONS
The use of a patient-specific drill guide constructed using stereolithography improved the accuracy of CPS placement in a cadaveric model.

Keyword

Subaxial cervical spine; Cervical pedicle screw fixation; Three-dimensional printing; Stereolithography; Patient-specific surgical template

MeSH Terms

Cadaver
Cervical Vertebrae
Female
In Vitro Techniques*
Pedicle Screws*
Printing, Three-Dimensional
Spine*
Vascular System Injuries