Pedal bone fractures

Summary Fractures of the pedal bone are usually the result of direct trauma, and are relatively commonly encountered in equine practice. Either front or hind feet may be affected. Seven distinct fracture types are recognised. Type I fractures involve the palmar/plantar process and do not enter the distal interphalangeal (DIP) joint. Type II fractures are oblique or parasagittal fractures that are articular but are not on the midline. Type III fractures are midline articular fractures that bisect the pedal bone into 2 equal halves. Type IV fractures involve the extensor (pyramidal) process of the pedal bone. Type V fractures are comminuted and split the pedal bone into multiple fragments. Type VI fractures are solar margin fractures. Type VII fractures are exclusive to foals and are also fractures of the solar margin. In most cases the onset of clinical signs is acute. The diagnosis is usually achieved by radiography, although computed tomography or magnetic resonance imaging can be helpful in some cases. Treatment options include surgical and nonsurgical therapies. The prognosis for articular fractures ( Types II and III ) is worse than for nonarticular fractures ( Types I , IV , VI and VII ) because of the likelihood of osteoarthritis within the DIP joint. Nonarticular fractures carry a good prognosis if a long enough convalescence is undertaken. Comminuted fractures ( Type V ) carry a poor, but not hopeless, prognosis.