Navicular disease in the horse. The subchondral bone pressure.

Summary

# Editorial Summary: Navicular Disease and Subchondral Bone Pressure Svalastoga and Smith examined intraosseous pressure dynamics within the navicular bone to establish whether the pathophysiology of equine navicular disease parallels that of arthrosis in humans. Using direct pressure measurement techniques, they compared subchondral bone pressures in affected horses against healthy controls, documenting both baseline pressure readings and the rate at which pressure normalised after provocation. Their findings demonstrated significantly elevated intraosseous pressure in navicular disease cases alongside prolonged pressure drop times, indicating impaired venous drainage and consequent venous stasis within the bone—a mechanism previously documented in human arthrotic joints. By establishing this pathological parallel, the authors reframed classical navicular symptoms (particularly resting pain) as logical consequences of bone hypertension and ischaemic episodes, suggesting that therapeutic approaches targeting venous perfusion rather than merely addressing joint mechanics might alleviate clinical signs. For practitioners, this mechanistic framework opens discussion around pressure-relieving interventions—whether through farriery, therapeutic exercise, or pharmacological approaches—and underscores why complete lameness resolution may require addressing underlying bone physiology rather than surface-level considerations alone.

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Key Findings

• •Horses with navicular disease demonstrated increased intraosseous pressure in the navicular bone compared to normal horses
• •Pressure drop time was lengthened in navicular disease patients, indicating venous stasis
• •Navicular disease pathophysiology resembles human osteoarthritis based on pressure dynamics
• •Classical clinical symptoms of navicular disease are consistent with resting pain patterns

Conditions Studied