Osseous pathologic changes in the lumbar region of the equine vertebral column: A descriptive post-mortem study in three breeds.
Authors: Spoormakers Tijn J P, Veraa Stefanie, Graat E A M, van Weeren P René, Brommer Harold
Journal: Equine veterinary journal
Summary
# Editorial Summary: Lumbar Osseous Pathology Across Equine Breeds Most knowledge about equine spinal degeneration comes from Thoroughbred studies, leaving practitioners with limited breed-specific data for diagnostic interpretation and prognostication in other populations. Researchers conducted computed tomography examinations of lumbar vertebral columns from 34 Warmblood horses, 28 Shetland ponies and 18 Konik horses post-mortem, scoring osteoarthritis of articular and intertransverse joints, intervertebral disc mineralisation, spinous and transverse process impingement, and spondylosis, then analysed breed differences statistically. Warmblood horses demonstrated substantially higher prevalence of articular process osteoarthritis (90%), spinous process impingement (36%) and transverse process impingement (35%) compared with the other breeds, whilst Konik horses showed notably increased intervertebral disc mineralisation (40%) and spondylosis (10%); Shetland ponies displayed the most severe intertransverse joint changes despite lower prevalence overall. All breeds showed age-related progression of degenerative changes, with Konik horses developing disc mineralisation more rapidly and Shetland ponies experiencing faster severity escalation in joint osteoarthritis, and strong bilateral symmetry in lesion distribution suggests biomechanical rather than unilateral factors driving pathology. These breed-specific patterns warrant consideration during clinical examination, imaging interpretation and management planning, particularly regarding expected severity trajectories and which pathologies warrant prioritised monitoring in different populations.
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Practical Takeaways
- •Breed predispositions exist for lumbar spine pathology; Warmbloods are prone to articular and process impingement issues while Konik horses develop disc mineralisation more rapidly with age
- •Age-related lumbar pathology is universal across breeds but progresses at different rates—monitor older Konik horses closely for disc changes and Shetland ponies for joint arthritis
- •Symmetrical left-right pathology patterns suggest underlying conformational or biomechanical factors rather than unilateral trauma, informing diagnostic and management approaches
Key Findings
- •Warmblood horses showed significantly higher prevalence of articular process osteoarthritis (90%), spinous process impingement (36%), and transverse process impingement (35%) compared to other breeds (p<0.001)
- •Konik horses had higher prevalence of intervertebral disc mineralisation (40%) and spondylosis (10%) compared to Warmbloods and Shetland ponies (p=0.03)
- •Shetland ponies demonstrated the highest severity scores for intertransverse joint osteoarthritis (p<0.001)
- •All pathologies except spondylosis in Shetland ponies showed positive correlation with age, with intervertebral disc mineralisation progressing faster in Konik horses (p<0.001)