Navicular disease (distal sesamoiditis, podotrochilitis, podotrochleosis, bursitis podotrochlearis) affects the distal sesamoid (navicular) bone and its surrounding structures in the equine limb. The disease is characterized by lameness of varied degrees, usually in the forelimbs. It is a difficult disease for clients to deal with because there is no known cure for navicular disease, and most treatments are only palliative.