Page 284 - The Veterinary Care of the Horse
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Figure 6.55 X-ray showing navicular changes: cyst-like lesions can be seen in this navicular bone
Interpretation of the radiographs is not always straightforward as many sound horses have
some changes as part of the normal ageing process. There is often poor correlation between
the extent of the radiographic changes and the degree of lameness.
SCINTIGRAPHY
Scintigraphy can be useful in cases where the radiographic changes are not particularly
helpful. Horses with navicular pathology often show increased uptake of radioactive material
due to increased bone turnover.
MAGNETIC RESONANCE IMAGING (MRI)
The increased use of MRI is helping to improve our knowledge of foot pain including
navicular disease. Lesions within other tissues as well as bone can be seen in detail. It can
detect soft tissue injuries. eg ligaments that are not visible on high quality radiographs.
ENDOSCOPIC EXAMINATION
The navicular bursa can be examined with a fine endoscope. The flexor surface of the
