Microvasculature of the suspensory ligament of the equine hind limb
Authors: Williams Megan R., Crisman Evan, Taylor Brianne M.
Journal: American Journal of Veterinary Research
Summary
# Editorial Summary: Microvasculature of the Equine Hind Limb Suspensory Ligament Williams and colleagues used contrast-enhanced CT imaging and tissue-clearing techniques on 18 cadaverous hind limbs to map the vascular anatomy of the suspensory ligament, identifying the medial and lateral plantar metatarsal arteries as primary suppliers alongside contributions from the plantar arteries and deep plantar arches. Notably, the microvasculature demonstrated uniform distribution throughout the proximal, midbody, and distal regions with no zones of relative hypovascularity, a finding corroborated by histological examination showing abundant vascular penetration into the ligament itself. These findings challenge the long-standing assumption that proximal suspensory ligament injuries in horses result from regional vascular insufficiency, suggesting instead that injury prevalence in this location must be attributed to biomechanical load distribution or other aetiological factors. For practitioners managing suspensory ligament pathology, this work underscores that therapeutic strategies targeting presumed avascular zones lack anatomical justification, redirecting clinical attention towards load management and tissue quality rather than vascular augmentation as primary treatment considerations.
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Practical Takeaways
- •Poor blood supply is not the reason why horses commonly injure their hind suspensory ligaments—practitioners should look to biomechanical or functional factors instead
- •The uniform vascular distribution suggests that hind suspensory ligament injuries result from mechanical stress or overload rather than ischaemic vulnerability
- •Treatment protocols should focus on load management and rehabilitation rather than assuming compromised healing potential due to vascular insufficiency
Key Findings
- •The hind limb suspensory ligament receives uniform microvascular supply from medial and lateral plantar metatarsal arteries throughout its entire length with no regional deficiencies
- •Histologic examination confirmed a network of connective tissue with vascular branches entering and surrounding the suspensory ligament at all levels
- •No evidence of hypovascularity exists in the proximal hind suspensory ligament region despite high clinical prevalence of injuries in this area