Digital perfusion, evaluated scintigraphically, and hoof wall growth in horses with chronic laminitis treated with egg bar-heart bar shoeing and coronary grooving.
Authors: Ritmeester, Blevins, Ferguson, Adams
Journal: Equine veterinary journal. Supplement
Summary
# Editorial Summary This 1999 study used nuclear scintigraphy to quantify digital blood perfusion in 10 chronically laminitic horses, comparing the effects of egg bar–heart bar shoeing alone versus combined with coronary grooving over an 18-week treatment period. Prior to intervention, all horses demonstrated the expected pathological perfusion pattern of decreased dorsal lamellar activity and increased solar/toe region activity; egg bar–heart bar shoeing significantly reversed this abnormality by restoring dorsal lamellar perfusion whilst reducing solar uptake, though adding coronary grooving did not further improve perfusion metrics despite producing a more favourable heel-toe hoof wall growth ratio. Seven of ten horses (70%) responded clinically with lameness improvement of at least one grade, and notably, pre-treatment scintigraphic findings were predictive of outcome—refractory cases had significantly lower baseline dorsal lamellar activity and elevated palmar coronary activity. These findings provide objective nuclear medicine evidence supporting egg bar–heart bar shoeing as a mechanically sound therapeutic intervention for chronic laminitis, whilst suggesting that scintigraphic assessment could help identify which horses are likely to respond favourably and thereby guide case selection and owner expectations.
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Practical Takeaways
- •Egg bar-heart bar shoeing is an evidence-based corrective technique that improves blood flow to the dorsal laminar region in chronic laminitis cases
- •Pre-treatment scintigraphic assessment can help identify which laminitic horses are likely to respond well to corrective shoeing, allowing better prognostic discussions with owners
- •While coronary grooving does improve hoof wall growth distribution, it does not add additional perfusion benefits beyond egg bar-heart bar shoeing alone
Key Findings
- •Egg bar-heart bar shoeing significantly increased dorsal laminar scintigraphic activity and decreased solar scintigraphic activity over 18 weeks
- •70% of horses (7/10) responded to treatment with improvement in lameness by at least one grade
- •Coronary grooving combined with egg bar-heart bar shoeing reduced heel-toe hoof wall growth ratio but did not enhance digital perfusion
- •Pre-treatment nuclear scintigraphy findings were predictive of clinical outcome, with lower dorsal laminar activity predicting treatment failure