Equine laminitis: cryotherapy reduces the severity of the acute lesion.
Authors: van Eps A W, Pollitt C C
Journal: Equine veterinary journal
Summary
# Equine Laminitis: Cryotherapy Reduces the Severity of the Acute Lesion Van Eps and Pollitt's 2004 research tested whether continuous cooling of the distal limb could prevent laminitis in horses experimentally challenged with carbohydrate overload, hypothesising that the vasoconstrictive and hypometabolic effects of cryotherapy might limit tissue damage. Six Standardbred horses had one front limb immersed continuously in ice/water whilst remaining limbs served as untreated controls; researchers then evaluated lameness clinically, graded lamellar histological damage, and measured matrix metalloproteinase-2 (MMP-2) mRNA expression as a marker of enzymatic tissue breakdown. Cryotherapy proved remarkably effective: cooled limbs showed no clinical lameness, whilst histological damage scores were significantly lower than in untreated contralateral forelimbs and all other limbs (P < 0.05), with MMP-2 expression substantially reduced in iced feet. The protective mechanism appears to involve dual action—vasoconstriction limiting the systemic delivery of damaging inflammatory mediators to the lamellae, combined with reduced metabolic activity that suppresses destructive enzyme activity. Although further investigation is warranted, these findings suggest cryotherapy warrants serious consideration as a prophylactic strategy for horses at high risk of acute laminitis, potentially influencing emergency management protocols in both clinical and field settings.
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Practical Takeaways
- •Ice therapy applied early to at-risk horses (e.g., after grain overload) may substantially reduce laminitis severity and prevent lameness
- •The mechanism appears to involve both vasoconstriction (blocking inflammatory triggers) and reduced metabolic activity in the laminae, suggesting immediate cold application is therapeutically sound
- •This offers a simple, non-invasive prophylactic strategy that could be implemented on-farm immediately when laminitis risk is identified
Key Findings
- •Cryotherapy was well tolerated and effectively cooled the feet in all 6 horses
- •No lameness was observed in cryotherapy-treated limbs despite laminitis induction in contralateral limbs
- •Histological laminitis scores in treated limbs were significantly lower than untreated forelimbs (P < 0.05)
- •MMP-2 mRNA expression was significantly reduced in iced feet compared to untreated feet (P < 0.05)