Authors of section


Cassio Ferrigno

Executive Editor

Amy Kapatkin

General Editor

Noel Moens

Open all credits

42-A1 Incomplete tibial fracture or fracture with fibula intact


42-A1 are incomplete fractures of the tibia/fibula. The tibia and fibula are paired bones. If one of them is fractured and the other one is intact, they are also classified as “incomplete”.


Incomplete fractures are very rare and typically occur in young animals affected by metabolic pathologies, such as nutritional secondary hyperparathyroidism. Fractures of only one of the two bones are occasionally encountered. They are generally simple minimally displaced fractures.


General considerations

The tibia has an S-shape in the frontal plane. This characteristic can be more pronounced in chondrodystrophic dogs. Even though this will not influence the fracture fixation method, it is important to bear it in mind when reconstructing the fracture and restoring the normal anatomy.

The fibula at the level of the tibia midshaft is very thin. For this reason, fractures of the fibula are generally not addressed.



42-A type fractures generally result from low energy trauma.

Clinical signs

Clinical signs observed in 42-A fractures are:

  • Edema of the region
  • Abnormal movement in the tibia shaft
  • Pain

Dogs with A1 type fractures may present with mild to severe non-weight bearing lameness. Dogs with incomplete fractures may still be able to use the limb.


Craniocaudal and lateral radiographic views are needed.