Equine limb cellulitis/lymphangitis resulting in distal limb ischaemia and avulsion of the hoof capsule
Authors: Duggan M., Mair T., Fews D.
Journal: Equine Veterinary Education
Summary
# Editorial Summary: Equine Limb Cellulitis/Lymphangitis with Distal Limb Ischaemia Whilst limb cellulitis and lymphangitis are commonly encountered in equine practice, severe complications including distal limb ischaemia remain poorly documented in the literature. Duggan and colleagues present a case of a 16-year-old Thoroughbred mare with left hindlimb cellulitis/lymphangitis that progressed to catastrophic failure of the hoof capsule, supported by post-mortem findings of extensive vascular thrombosis. Culture and sensitivity identified *Staphylococcus aureus* (profuse growth) and coliforms as causative organisms; despite appropriate antimicrobial therapy, analgesia and anti-inflammatory treatment, the mare developed hyperextension of the metatarsophalangeal joint by Day 5 and complete hoof capsule avulsion by Day 10 of hospitalisation. Post-mortem examination revealed fibrin thrombi within the suspensory ligament branches and lamellar vasculature, alongside necrosis of the dermal laminae and extensive interstitial haemorrhage and oedema—a pattern suggesting severe vascular compromise had developed within days of initial presentation. This case underscores the potential for cellulitis/lymphangitis to precipitate life-threatening complications through thrombotic mechanisms, emphasising the importance of early recognition of deterioration (such as digit hyperextension) and the need for aggressive therapeutic intervention, though the rapid progression here suggests practitioners should remain alert to horses where clinical improvement plateaus or reverses despite appropriate treatment.
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Practical Takeaways
- •Cellulitis/lymphangitis requires urgent recognition and aggressive early treatment; hyperextension of the metatarsophalangeal joint is a critical warning sign indicating vascular compromise and poor prognosis
- •Obtain culture and sensitivity early as Staphylococcus aureus and coliforms are common causative organisms requiring targeted antimicrobial therapy
- •Distal limb ischaemia secondary to vascular thrombosis can develop rapidly in severe cases despite appropriate supportive care, necessitating realistic prognostic discussion with owners
Key Findings
- •Severe cellulitis/lymphangitis progressed to distal limb ischaemia with thrombosis of lamellar and suspensory ligament vasculature within 10 days
- •Complete hoof capsule avulsion occurred secondary to extensive dermal lamellar necrosis caused by fibrin thrombi in relatively large vessels
- •Culture identified Staphylococcus aureus (profuse growth) and coliform bacteria from superficial pustules
- •Systemic antimicrobial, anti-inflammatory, and analgesic treatment failed to prevent progression to irreversible tissue necrosis