A review of radiographic interpretation of the navicular bone

Abstract

Navicular syndrome (also called navicular disease) plays a major role in the equine industry as a chronic, degenerative and often career-limiting disease process which affects a variety of breeds of horses. In addition to clinical signs and diagnostic analgesia, diagnostic imaging plays a key role in identification of this disease process – radiography is the most used imaging modality. In addition to their clinical utility, foot radiographs are a standard element of most pre-purchase examinations. Good radiographic quality and positioning are necessary for accurate interpretation. Radiographic lesions of the navicular bone such as sclerosis, enlarged synovial invaginations, distal border fragments and flexor cortical erosions are important to identify and understand because of their potential role in the disease process. This article reviews an approach to radiological evaluation and interpretation of lesions affecting the navicular bone.