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Are matrix and vascular changes involved in the pathogenesis of deep digital flexor tendon injury in the horse?

Sam Beck1, Tony Blunden, Sue Dyson

  • 1The 608 Vet Group, 608 Warwick Road, Solihull B91 1AA, UK.

Veterinary Journal (London, England : 1997)
|August 9, 2011
PubMed

Insights

Horses with chronic foot pain show increased blood vessel frequency and proteoglycan staining in their deep digital flexor tendons (DDFT). This suggests potential degenerative changes and a reparative vascular response in equine tendonopathy.

Area of Science:

  • Veterinary Medicine
  • Equine Science
  • Histopathology

Background:

  • Chronic foot pain in horses is a significant welfare concern.
  • The deep digital flexor tendon (DDFT) is crucial for equine locomotion.
  • Understanding DDFT changes associated with pain is vital for diagnosis and treatment.

Purpose of the Study:

  • To investigate histological differences in the DDFT of horses with and without chronic foot pain.
  • To assess blood vessel frequency, proteoglycan staining, and matrix composition.
  • To explore potential indicators of degenerative change and reparative responses.

Main Methods:

  • Histological analysis of DDFT samples from chronic pain (Group L) and control (Group N) horses.
  • Haematoxylin and eosin staining for micro-anatomical assessment.
  • Safranin O fast green staining for proteoglycan quantification.
  • Factor VIII immunolocalisation for vascular endothelial cell identification.

Main Results:

  • Increased blood vessel frequency was observed in Group L compared to Group N (P=0.048).
  • Higher proteoglycan staining intensity was found in Group L (P=0.028).
  • Qualitative differences in matrix and tenocytes, and reduced Factor VIII staining in Group L vasculature were noted.

Conclusions:

  • Chronic foot pain in horses is associated with altered DDFT matrix composition.
  • Increased vascularity in the DDFT may indicate a reparative response to degenerative tendonopathy.
  • These findings suggest potential biomarkers for equine foot pain and degenerative changes.

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