Intraosseous pressure and pathologic changes in horses with navicular disease.
Authors: Pleasant, Baker, Foreman, Eurell, Losonsky
Journal: American journal of veterinary research
Summary
# Editorial Summary: Intraosseous Pressure and Navicular Disease Elevated pressure within the navicular bone may be a primary driver of the degenerative changes characteristic of navicular disease, according to this controlled study comparing eight affected horses with four sound controls. Using simultaneous pressure measurements from the navicular bone and systemic circulation (medial palmar artery and saphenous vein) alongside detailed pathological examination, researchers found that diseased navicular bones exhibited significantly higher intraosseous pressures (P < 0.001), whilst systemic vascular pressures remained comparable between groups. Gross and microscopic examination revealed substantially more severe pathological changes on the flexor cortex of affected bones, including pronounced marrow fibrosis, though the hyaline articular cartilage itself showed no significant difference between groups—suggesting the primary pathology concentrates in the fibrocartilage and underlying bone rather than the articulating surface. These findings propose a pressure-driven mechanism of navicular disease involving compromised medullary perfusion and stress-induced remodelling of the flexor cortex, which has important implications for farriery, veterinary treatment strategies and management approaches aimed at reducing intraosseous pressure and improving bone perfusion in affected horses.
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Practical Takeaways
- •Elevated intraosseous pressure in the navicular bone is a hallmark of navicular disease and may be a therapeutic target for management strategies
- •Pathologic changes are most pronounced on the flexor surface and in marrow spaces, informing understanding of pain mechanisms in this condition
- •Systemic vascular pressure changes are not the primary driver of navicular disease, suggesting local bone perfusion and pressure dynamics are key to pathogenesis
Key Findings
- •Mean navicular bone intraosseous pressure was significantly higher in horses with navicular disease compared to controls (P < 0.001)
- •Flexor surface gross pathologic and fibrocartilage histologic scores were significantly more severe in diseased horses (P < 0.001)
- •Systemic arterial and venous pressures did not differ significantly between diseased and control horses
- •Marrow space fibrosis beneath the flexor cortex was more pronounced in navicular disease horses