Is the Movement of the Thoracolumbar and Lumbosacral Joints in the Ridden Dressage Horse Affected by Muscle Development?
Authors: Walker V.A., Tranquille C.A., Duch S.E., Northrop A.J., Spear J., Brandham J., Murray R.C.
Journal: Equine Veterinary Journal
Summary
# Editorial Summary Back pain affects approximately one in four UK dressage horses over any two-year period, yet the mechanisms protecting against this debilitating condition remain incompletely understood. Walker and colleagues used high-speed motion capture at 250 Hz to analyse thoracolumbar and lumbosacral flexion–extension movements in 35 dressage horses (ranging from novice to Grand Prix level) during collected trot, correlating these kinematic measurements with clinician-assigned grades for visible muscle development. Greater development of neck, lumbar, lumbosacral and pelvic muscles was significantly associated with increased flexion at both the thoracolumbar and lumbosacral joints at specific phases of the stride, whilst paradoxically, increased muscle development in the thoracic and lumbar regions corresponded with *reduced* lumbosacral range of motion. These findings suggest that well-developed musculature functions primarily as a stabilising mechanism rather than promoting mobility, protecting the intervertebral joints and ligaments by limiting excessive motion rather than enabling it. For practitioners, the implication is clear: systematic evaluation of muscle development during clinical examination provides a practical indicator of spinal stability and may help guide both prevention strategies and rehabilitation protocols for horses with ridden back problems.
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Practical Takeaways
- •Assess visible muscle development during veterinary examinations as an indicator of back stability and support for rider weight
- •Well-developed thoracic, lumbar, and abdominal muscles are associated with better lumbosacral stabilization in dressage horses
- •Muscle development evaluation can guide prevention and rehabilitation protocols for ridden back problems in performance horses
Key Findings
- •Increased visible muscle development correlated with increased thoracolumbar and lumbosacral flexion at specific points in the stride
- •Decreased lumbosacral range of motion was associated with increased muscle development in thoracic and lumbar regions
- •Muscle development grades on clinical examination correlate with spinal stability during ridden movement