Retrospective study of the clinical features of limb cellulitis in 63 horses.
Authors: Fjordbakk C T, Arroyo L G, Hewson J
Journal: The Veterinary record
Summary
# Limb Cellulitis in Horses: Clinical Patterns and Outcomes Between 1994 and 2005, Fjordbakk, Arroyo and Hewson reviewed 63 cases of acute limb cellulitis presenting with painful generalised swelling, establishing clinical patterns that remain relevant to modern practice management. Hindlimbs were significantly more frequently affected than forelimbs, and Thoroughbreds showed breed predisposition, though the retrospective nature of the cohort warrants consideration of potential referral bias. Blunt trauma, surgical intervention and limb injections accounted for most cases, yet notably 43% presented without an identifiable precipitating cause—suggesting occult subclinical injuries or haematogenous seeding warrant investigation in idiopathic presentations. Culture results identified Staphylococcus aureus and Streptococcus species as predominant pathogens, with mixed infections common enough to justify broad-spectrum antimicrobial cover, which combined with NSAIDs formed the standard treatment alongside ultrasound-guided drainage in selected cases. An 89% discharge rate is encouraging, though the seven fatal cases underscore a critical complication: contralateral limb laminitis emerged as the primary cause of euthanasia, highlighting the need for aggressive weight management, appropriate farriery and vigilant monitoring during recovery from unilateral limb disease.
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Practical Takeaways
- •Limb cellulitis in horses has a good prognosis with appropriate treatment (89% discharge rate), but clinicians should monitor the contralateral limb closely as laminitis is a major complication
- •Many cellulitis cases present without an obvious traumatic cause; maintain a broad diagnostic approach and treat empirically with broad-spectrum antimicrobials pending culture results
- •Hindlimbs are more commonly affected—consider this predisposition when evaluating horses with acute limb swelling and maintain higher clinical suspicion in this population
Key Findings
- •Hindlimbs were significantly more frequently affected than forelimbs (P<0.05)
- •Thoroughbreds were over-represented compared to general hospital population
- •No identifiable cause found in 43% of cases despite blunt trauma, surgery, and injections being common precipitants
- •89% survival rate (56/63 horses discharged); contralateral limb laminitis was the primary reason for euthanasia in 7 cases
- •Staphylococcus aureus and Streptococcus species were frequently isolated, with mixed bacterial infections common