Occlusion of the digital arteries - A model for pathogenesis of navicular disease

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Abstract
The digital arteries in 10 horses suffering from navicular disease and from 7 horses from a control group were examined angiographically. The horses from the disease group showed complete or partial occlusion of the digital arteries in all cases. In the control group, isolated vessel obstructions were also found, but these were limited to narrowing of part of an artery only. Histological investigations showed that total occlusion of a vessel involved an organized thrombus, but that partial occlusion generally involved changes in the vascular wall similar to those caused by endarteritis obliterans. The vessel changes are discussed, with particular reference to their possible significance as a cause of navicular disease.