Ventral Surgical Approach to the Lumbosacral Joint in the Dog

Authors

  • Jerry O'Riordan MVB Cert SAS,

    Corresponding author
    • Section of Veterinary Clinical Studies, School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Ireland
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  • Pierre H. M. Moissonnier DMV PhD Diplomate ECVS,

    1. Section of Veterinary Clinical Studies, School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Ireland
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  • Barbara M. Kirby DVM MS Diplomate ACVS & ECVS

    1. Section of Veterinary Clinical Studies, School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Ireland
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  • Presented in part at the 19th Annual Scientific Meeting of the European College of Veterinary Surgeons, Helsinki, Finland, July 1–3, 2010.

Corresponding Author

Jerry O'Riordan, University Veterinary Hospital, University College Dublin, Belfield, Dublin 4, Ireland

E-mail: treidliachta@gmail.com

Abstract

Objective

To describe a ventral surgical approach to the lumbosacral (LS) junction, access to L7 and S1, and access to the LS disc.

Study Design

Cadaveric descriptive study.

Animals

Canine cadavers (n = 6).

Methods

A ventral surgical approach to the LS junction was made and local anatomic structures documented. Accessible ventral L7 and S1 vertebral bodies and LS disc were marked with India ink. Total and marked surface areas were calculated. The potential for bicortical and unicortical implant placement was determined in transverse slices of L7 and S1. Exposed ventral disc annulus relative to vertebral canal diameters were measured.

Results

Portions of L7 and S1 were accessible in all dogs, but shape and dimensions varied. Ventral access for implant placement was available in both L7 and S1 in every dog. The median sacral artery and vein were in contact with the ventral LS disc annulus in every dog. Accessible ventral annulus were greater than vertebral canal in all dogs.

Conclusions

Ventral approach to the LS junction is possible, with LS discectomy, and implant placement in L7 and S1 vertebral bodies possible from this approach. Injury to, or sacrifice of, the median sacral artery and/or vein may occur in this approach.

Ancillary