A study of 118 cases of navicular disease: radiological features.
Authors: Wright
Journal: Equine veterinary journal
Summary
Wright's 1994 examination of 118 horses with navicular disease employed three standard radiographic projections to characterise which bone changes correlated with clinical lameness, distinguishing between sound and lame limbs in unilaterally affected animals and comparing most versus least lame limbs in bilateral cases. Whilst distal border synovial invaginations and flexor cortex changes (flattening and thinning) showed no meaningful relationship to lameness severity, defects within the flexor cortex itself, proximal border remodelling, medullary trabecular disruption and medullary sclerosis all demonstrated clear associations with both limb involvement and lameness grade. Additional findings linked proximal border enthesophytes and poor flexor corticomedullary demarcation to lameness severity, with the latter feature plus distal border fragmentation proving particularly significant in asymmetrically bilaterally affected horses. These results offer clinicians a framework for interpreting radiographs with greater diagnostic precision: rather than assuming all navicular changes are equally pathologically relevant, practitioners can weigh radiological findings differently according to their demonstrated correlation with clinical signs. For farriers and physiotherapists working alongside veterinary teams, understanding which radiological features truly predict functional compromise helps contextualise treatment strategies and rehabilitation priorities.
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Practical Takeaways
- •Multiple radiographic features of navicular disease correlate with clinical lameness; flexor cortex defects and medullary changes are most prognostically significant
- •Not all radiological findings in navicular disease are clinically relevant—distal border invaginations and flexor cortex thinning do not reliably predict lameness severity
- •In bilateral cases, focus on poor corticomedullary demarcation and distal border fragmentation as better indicators of asymmetrical disease severity
Key Findings
- •Flexor cortex defects, proximal border remodelling, medullary trabecular disruption, and medullary sclerosis correlated with limb affliction and lameness severity
- •Proximal border enthesophytes and poor flexor corticomedullary demarcation showed relationship to lameness grade
- •Distal border synovial invaginations and flexor cortex flattening/thinning showed no relationship to lameness distribution or severity
- •Poor flexor corticomedullary demarcation and distal border fragmentation were associated with severity in bilateral asymmetrically affected horses