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Vet Comp Orthop Traumatol. 2017 Nov;30(6):413-423. doi: 10.3415/VCOT-17-03-0046. Epub 2017 Dec 4.

Computed Tomographic Analysis of Ventral Atlantoaxial Optimal Safe Implantation Corridors in 27 Dogs.

Author information

Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada.
School of Engineering, University of Guelph, Guelph, Ontario, Canada.


Objectives Ventral atlantoaxial stabilization techniques are challenging surgical procedures in dogs. Available surgical guidelines are based upon subjective anatomical landmarks, and limited radiographic and computed tomographic data. The aims of this study were (1) to provide detailed anatomical descriptions of atlantoaxial optimal safe implantation corridors to generate objective recommendations for optimal implant placements and (2) to compare anatomical data obtained in non-affected Toy breed dogs, affected Toy breed dogs suffering from atlantoaxial instability and non-affected Beagle dogs. Methods Anatomical data were collected from a prospectively recruited population of 27 dogs using a previously validated method of optimal safe implantation corridor analysis using computed tomographic images. Results Optimal implant positions and three-dimensional numerical data were generated successfully in all cases. Anatomical landmarks could be used to generate objective definitions of optimal insertion points which were applicable across all three groups. Overall the geometrical distribution of all implant sites was similar in all three groups with a few exceptions. Clinical Significance This study provides extensive anatomical data available to facilitate surgical planning of implant placement for atlantoaxial stabilization. Our data suggest that non-affected Toy breed dogs and non-affected Beagle dogs constitute reasonable research models to study atlantoaxial stabilization constructs.

[Indexed for MEDLINE]

Conflict of interest statement

Conflict of Interest: None of the authors has any financial or personal relationships that could inappropriately influence or bias the content of the paper. Once approval of the study design was obtained, the funding body was not involved in the collection, analysis and interpretation of data and was also not involved in writing the manuscript.

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