The Future Of Hoof Care, As In The Past, Is Sole Protection Contrary to popular legend, horseshoes were not invented to protect hooves against wear.

IV Tildren for Navicular Syndrome The efficacy of administering the injectable bisphosphonate medication for horses (Tildren) in two different ways was evaluated for the treatment of navicular syndrome. Twelve horses diagnosed with bilateral navicular syndrome were randomly assigned to receive Tildren either systemically by intravenous injection or by using regional limb perfusion, where the drug is “back-flushed” directly into the blood vessels of the lower limb so that it is delivered to the lower limb and hoof in a more direct, concentrated manner.

The hoof capsule comprises the hoof wall, sole, frog and bulbs of the heels; which, through the unique continuous bond between its components, form a casing on the ground surface of the limb that affords protection to the soft tissue and osseous structures enclosed within the capsule.

Since the question is regarding a foundered horse, I will assume that it is beyond laminitis and the third phalanx has rotated.