Vascular perfusion in horses with chronic laminitis.

Summary

Hood, Grosenbaugh and Slater used vascular perfusion casts to map circulatory defects in the distal digits of 11 chronically laminitic horses against five normal controls, classifying laminitic horses as either potentially treatable or clinically refractory based on clinical presentation. Eleven distinct macroscopic vascular lesions were identified across three vascular territories—the submural laminar, coronary, and solar circulations—with multiple defects typically occurring simultaneously within individual hooves. Significantly, horses deemed clinically refractory demonstrated substantially worse perfusion defects than their potentially treatable counterparts, whilst compression of the solar vasculature and ventral displacement of the third phalanx (sinkers) emerged as far more common complications than previously recognised. These findings suggest that vascular assessment could meaningfully improve clinical decision-making around prognosis and treatment planning in chronic laminitis cases. For practitioners, this underscores the importance of considering circulatory compromise—not merely mechanical factors—when evaluating whether a laminitic horse warrants intensive therapeutic intervention or palliative management.

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Key Findings

• •Eleven macroscopic vascular defects were identified in distal digit casts from laminitic horses across three circulation beds: submural laminar (4 types), coronary (3 types), and solar (4 types)
• •Clinically refractory horses showed significantly worse perfusion defects in vascular casts compared to horses classified as potentially treatable
• •Ventral displacement of the third phalanx (sinkers) and solar vasculature compression are more prevalent than previously documented

Conditions Studied