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Navicular Syndrome
Navicular syndrome, or navicular region syndrome is a nebulous and complicated topic. First of all, it is often a misnomer and can be very difficult to diagnose. In my experience, clinical signs are most telling of location and type of problem because imaging can be so misleading. Many times I have seen X-ray images which look like the horse should not walk, but is sound. Likewise, I have seen many images which appear very clean, but the horse is crippled. X-rays only provide reliable information when there is a reference x-ray available.
This is such a nebulous subject that many technical books have very little to say. Most of what I have learned comes from case experiences with Dr. Morrison of Rood & Riddle.
I'll put together some case studies from our files which show the various clinical situations, the diagnostics used, and then the therapeutic modalities that help the horse. 12/16/07
Clinical signs: Typically horses have a toe first landing (maybe bruising of the toe) and a shortened stride as they try to stay off their heels.
Diagnostics: Hoof testers should be (skillfully and with experience) used to check for local pain in the navicular bone area. Trotting in tight circles can provide more information.
Treatment (management & medicine):
Constant turnout and gradual conditioning is important. Moisture content should be managed to keep hooves pliable. When stalled, bedding should me somewhat moist (not wet).
Isoxsuprine Hydrochloride: 60 to 80 percent success rate according to Rose and Hodgson (1993).
Neurectomy of the posterior digital nerve can be a consideration.
Treatment (orthopedic):
If hoof/pastern and break-over balance is appropriate, Natural Balance shoes have the research and field trials confirming success.
If hoof/pastern balance is inappropriate, then many fabricated appliances can be made out of aluminum (for lightness).
A bar welded in the correct area aids in protecting the sensitive navicular region. Dr. George Platt and Burney Chapman have shown how heart bars can be very effective.
I have used open toe/reverse shoes with and without heart bars successfully.
Cases Coming...