Many medical therapies are used in treatment of navicular disease however without appropriate mechancial treatment many medical therapies only offer temporary relief. Bursa injections, coffin joint injections, isoxoprine and tildren are common treatments. But you can see that without mechanical therapy that offers appropriate physical relief it can be difficult to manage. Cases like this can be difficult to manage at a performance level long term with mechanics and medical therapies and all but impossible without mechanical therapy.
Note the lucent regions on the radiographs and the corresponding lesion below. The tendon has grown into the navicular bone secondary to years worth of the tendon rubbing against the roughened flexor surface of the navicular bone. This causes abrasions on the tendon that leads to the adhesions connecting it to the navicular bone.
|Viewing from front of hoof with navicular bone flipped up to expose the flexor (back) surface of the navicular bone in which the tendon glides over then attaches to coffin bone.|
|Note the two adhesions on flexor surface. These where cut away from tendon|
|This drawing shows the DDFT in green and adhesions in red|
Below are pre- and post-shoeing radiographs. Note the drastic changes in palmar angle, tendon surface angle and distance of navicular bone to the condyle of proximal second phalanx (short pastern). In the rocker shoe the system is now a self adjusting mechanism with greatly decreased load on lesions and a greatly reduced leverage on the ddft. Again, this horse's lameness improved at least 80 percent with application of this shoe.