Innervation and nerve injections of the lumbar spine of the horse: a cadaveric study.

Summary

# Editorial Summary: Innervation and nerve injections of the lumbar spine of the horse Whilst equine clinicians routinely employ regional anaesthetic blocks to isolate sources of distal limb lameness, comparable techniques for back pain localisation have remained underdeveloped—largely because the detailed anatomy of lumbar spinal innervation in horses was never properly mapped. Vandeweerd and colleagues performed a systematic cadaveric dissection of the lumbar spine to characterise nerve supply to the vertebrae, facet joints, and associated soft tissues, documenting injection sites and trajectories for each anatomical structure. The research identified distinct nerve pathways supplying the lumbar vertebral bodies, intervertebral discs, facet joints, and surrounding ligaments, providing precise anatomical reference points for targeted local anaesthetic administration. Armed with this anatomical foundation, practitioners now have evidence-based guidance for performing diagnostic nerve blocks to systematically eliminate lumbar structures as pain sources during back pain investigation—a methodology directly analogous to the lameness protocols already embedded in equine practice. For farriers, physiotherapists, and veterinarians managing performance horses with back pain, this work represents a critical bridge between anatomical knowledge and clinical application, enabling more confident localisation of pain and more targeted therapeutic intervention.

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Key Findings

• •Cadaveric dissection provided detailed anatomical description of lumbar spine innervation in horses previously poorly characterized in literature
• •Study identified nerve pathways relevant to local anesthetic techniques for localizing equine back pain
• •Precise innervation mapping may improve clinical ability to determine origin of back pain in lame horses

Conditions Studied