![]() ![]() Recurrence is common and most likely in horses that have associated PSD (see Chapter 72). Conservative management using a progressive increase in exercise without turnout is usually successful. Bilateral avulsion fractures or stress reactions occur. A well-defined fracture is often not detectable radiologically, and usually only suspicious areas of radiolucency and increased radiopacity are seen. It is important to differentiate IRU from that seen in the tarsometatarsal joint, but concomitant IRU in both areas is not unusual. Focal areas of IRU are seen that are roughly triangular and involve the proximal plantar aspect of the MtIII ( Figure 43-4). Local signs of swelling are usually absent, and diagnostic analgesia is essential for localization of pain. Fractures occur most commonly in dressage horses, jumpers, and STB racehorses. Horses can have acute-onset or chronic mild-to-moderate hindlimb lameness, depending on size and duration of fracture. Ross, in Diagnosis and Management of Lameness in the Horse (Second Edition), 2011 Avulsion Fractures of the Third Metatarsal Bone Associated with the Origin of the Suspensory LigamentĪvulsion fractures of the MtIII that are associated with the origin of the SL are frequently seen and can be solitary injuries or associated with PSD. In other breeds, type IV and V fractures predominate. 9 Type II injuries rarely occur alone they are usually seen concurrently with type I fractures. Type I fractures constitute 67% of the injuries in the racing greyhound and occur almost exclusively in the right limb, whereas type III injuries are the least common and occur mainly in the left limb. May extend into the articular surface (see Figure 14-16). Combined intraarticular and extraarticular fractures Type V, comminuted fracture of the body. Type IV, proximal apical.Īvulsion fracture of the tendon of insertion of the flexor carpi ulnaris muscle at the proximal surface of the palmar end of the bone (see Figure 14-15, A). Extraarticular fractures Type III, distal apical.Īvulsion fracture of the distal margin of the palmar end of the bone at the origin of the two palmar accessorometacarpal ligaments (see Figure 14-13, E). Type II, proximal basilar.Īvulsion fracture of the proximal margin at the insertion of the ligaments to the radius, ulna, and radial carpal bone (see Figure 14-13, C). Schaefer MS, DVM, in Brinker, Piermattei and Flo's Handbook of Small Animal Orthopedics and Fracture Repair (Fifth Edition), 2016 Classification Intraarticular fractures Type I, distal basilar.Īvulsion fracture of the distal margin of the articular surface at the origin of the accessoroulnar carpal ligaments (see Figure 14-13, A). ![]()
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