2 Findings for the dog of the present report further supported the importance of diagnostic imaging and provided additional information on surgical decisions, which are limited in the literature regarding Monteggia fractures. Between the radius and ulna, sliding motion occurs during ambulation that increases shear forces on implants. Despite a successful repair for the dog of the present report, it was discussed with the owner that potential removal of the screw may be indicated in the future due to migration or failure from shearing forces. A single screw placement rather than a combination of radial head screw and ulnar bone plate was chosen due to the small size of the dog and the more distal location of the ulnar fracture. 5 Orthogonal radiographic views are essential for appropriate diagnosis, and an appropriate diagnosis is crucial for planning surgical treatment and minimizing complications. However, in the dog of the present report, radial head luxation was not palpable on examination, which could have been because of the extent of soft tissue swelling present at 3 days after the injury occurred and further supported the importance of diagnostic imaging.įor veterinary patients, ulnar fractures usually require radiographic diagnosis because abnormal lateral movement may be attributed only to the radial head luxation on examination. Orthopedic examination can facilitate diagnosis of radial head luxation via palpation. Purpose Monteggia variant defined as Monteggia fracture dislocation with radial head or neck fracture, coronoid fracture, ulnohumeral joint dislocation or combination of these injuries. Imaging is pivotal not only for the diagnosis and appropriate specification of the type of Monteggia fracture but also the development of a patient-specific therapeutic plan. In fact, children are most commonly affected by type III Monteggia fracture secondary to traumatic varus force while the elbow joint is extended. The dog of the present report had a type III Monteggia fracture, which is rarely seen in people 4 or veterinary patients. 1 In small animal patients, type I is most common 2, 3 and defined as cranial luxation of the radial head. These fractures are classified as types I through IV on the basis of the direction of radial head luxation. Monteggia fractures are characterized by luxation of the radial head combined with proximal ulnar fractures that are most frequently due to trauma and uncommon in small animal patients.
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