The effect of artificial occlusion of the Ramus navicularis and its branching arteries on the navicular bone in horses: an experimental study.

This research article studies the impact of deliberate blockage of specific arteries on the navicular bone in horses. The findings suggest that limiting the blood supply to this bone might play a significant role in the development of navicular disease.

Background and Purpose of the Study

• The authors of this study sought to gain a clearer understanding of the development and progression of navicular disease in horses, which is a common but not well understood equine condition.
• They focused on exploring the effects of occluding – or blocking – the Ramus navicularis (R. Navicularis) and its branching arteries, which supply blood to the navicular bone in horses, and comparing these changes to those found in navicular disease.

Methodology

• The authors evaluated the effects of this experimental occlusion in a thorough and multi-faceted manner, using several different diagnostic and assessment methods, including clinical assessment, radiography (x-rays), arteriography (a type of imaging used to visualize the inside of blood vessels), scintigraphy (a form of diagnostic test in which a very small dose of radioactive material is used to diagnose disease), and histology (studying the microscopic anatomy of cells and tissues).

Findings

• The results concluded that the deliberate blockage of the Ramus navicularis and its branching arteries led to changes that closely resembled those observed in horses suffering from navicular disease.
• The key findings included increased bone remodelling, a shift in arterial pattern, the formation of collateral blood vessels, and an increased amount of connective tissue in the synovial membrane and nutrient foramina (small holes in bones where blood vessels or nerves pass through).
• These changes were interpreted as being a reaction to the reduction in the distal arterial supply to the navicular bone.

Significance of the Results

• The study’s results support the hypothesis that reduced arterial blood supply to the navicular bone plays a significant role in navicular disease’s pathogenesis, or development.
• This research may form the basis for future studies or treatments aimed at managing or preventing the onset of navicular disease in horses.