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Fracture of the extensor process of the distal phalanx in a bull and a cow
  1. K. Taguchi, DVM, PhD,
  2. S. Nakamura, DVM and
  3. K. Hyakutake, DVM
  1. Department of Large Animal Clinical Sciences, Rakuno Gakuen University, 582 Midorimachi, Bunkyodai, Ebetsu, Hokkaido, 069-8501, Japan
  1. E-mail for correspondence k-tgc{at}


Two cases of extensor process fracture of the distal phalanx in the forelimb in a Holstein bull and a lactating Holstein cow are described. Each animal showed acute onset of severe lameness with a gait characterised by lengthening of the cranial phase of the step in order to place more weight on the heel. Mild swelling and a localised pain response upon application of deep pressure above the coronet were also observed. A definitive diagnosis was made by radiography with complementary ultrasonography, which provided the best definition of the fracture fragment over the dorsal aspect of the distal interphalangeal joint. Applying a wooden block to a sound claw for three weeks was curative and provided a good prognosis in both cases.

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