Small Animal Radiology and Ultrasound: A Diagnostic Atlas and Text

Chapter Four The Appendicular Skeleton 497
A
B
Fig. 4-28 A 6-month-old male mixed breed dog was hit by a car and had
a non–weight-bearing lameness of the right front leg. A, There are transverse
fractures of the radius and ulna involving the junction of the middle
and distal thirds. There is slight lateral and caudal displacement of the distal
fragments. There is mild soft-tissue swelling of the area. B, Follow-up
radiographs were obtained 2 weeks following the initial injury. The leg had
been placed in a cast. There is no change in position of the fracture fragments
when compared with the initial radiographs. The fracture lines
appear slightly wider, with indistinct margins due to resorption at the fracture
edges. There is a minimal amount of periosteal proliferation. The physes
appear normal without evidence of growth plate trauma. C, Follow-up
radiographs were obtained 1 month after the initial injury. The fracture has
healed completely and the fracture lines are no longer visible. There is slight
malalignment at the fracture site. The distal radial and ulnar physes remain
open without evidence of growth deformity. There is demineralization of
the bones distal to the fracture site. This is due to disuse from immobilization
of the limb in a cast. Diagnosis: Healed transverse fracture.
C