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Feasibility for Measuring Transverse Area Ratios and Asymmetry of Lumbosacral Region Paraspinal Muscles in Working Dogs Using Computed Tomography

By Bethany Cain, Jeryl C. Jones, Ida Holásková, Larry Freeman, Bess Pierce

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Category Journal Articles
Abstract

Objectives: Describe computed tomographic (CT) anatomy of canine lumbosacral (LS) paraspinal muscles, a method for measuring paraspinal muscle transverse area ratios and asymmetry using CT, and application of this method in a small sample of working dogs with versus without LS pain.

Methods: Published anatomy references and atlases were reviewed and discrepancies were resolved by examination of anatomic specimens and multiplanar reformatted images to describe transverse CT anatomy of LS region paraspinal muscles. Sixteen Belgian malinois military working dogs were retrospectively recruited and assigned to LS pain positive versus negative groups based on medical record entries. A single observer unaware of dog group measured CT transverse areas of paraspinal muscles and adjacent vertebral bodies, in triplicate, for L5–S1 vertebral locations. A statistician compared muscle transverse area ratios and asymmetry at each vertebral location between groups.

Results: The relative coefficient of variation for triplicate CT area measurements averaged 2.15% (N= 16). Multifidus lumborum (L6–7), psoas/iliopsoas (L5–6, L6–7), and sacrocaudalis dorsalis lateralis (L6–7, L7–S1) transverse area ratios were significantly smaller in dogs with LS pain (n = 11) versus without LS pain (n = 5) (p ≤ 0.05). Muscle asymmetry values were not significantly greater in dogs with versus without LS pain.

Clinical relevance: Computed tomographic morphometry of LS region paraspinal muscles is a feasible objective method for use in future evidence-based research studies in working dogs. Potential future research applications include determining whether decreased paraspinal muscle area ratios and/or increased paraspinal muscle asymmetry could be used as markers for preclinical LS pain in stoic dogs or risk factors for other injuries in high performance canine athletes, or determining whether core muscle strengthening exercise prescriptions for dogs with LS pain have an effect on paraspinal muscle area ratios and asymmetry.

Submitter

Mason N McLary

HABRI Central

Date 2016
Publication Title Frontiers in Veterinary Science
Volume 3
Issue 34
Publisher Frontiers
DOI 10.3389/fvets.2016.00034
URL https://doi.org/10.3389/fvets.2016.00034
Language English
Additional Language English
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Tags
  1. Animal-assisted activities
  2. Animal health and hygiene
  3. Animal roles
  4. Animals in culture
  5. Animal welfare
  6. Canine
  7. Dogs
  8. Health
  9. Horses
  10. Mammals
  11. muscles
  12. Physical environment
  13. Social Environments
  14. Working animals