Talar Neck Fracture
Involved in a road traffic accident. Pain and inability to use left foot afterward.
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There is a displaced vertical fracture of the neck of the left talus with dislocation of the tibiotalar and talocalcaneal joints. The talonavicular joint maintains a normal articulation. Small osseous fragments are also noted posterior to the talus.
The tibia, fibula and other tarsal bones appear normal.
There is posteromedial extrusion of the talar body.
Soft tissue swelling of the left ankle noted. No breach of the soft tissue outline noted.
Hawkins-Canale type III fracture of the neck of the left talus.
Posterior process fracture of the left talus.
All three of the major sources of blood supply to the talus are commonly injured with type III talar neck fractures.
risk of avascular necrosis (AVN) increases with increasing classification type
- type I fractures have 0%–15% risk
- type II fractures have 20%–50% risk
- type III fractures approach 100% risk
- type IV fractures have 100% risk
- 1. Yulia Melenevsky, Robert A. Mackey, R. Brad Abrahams, Norman B. Thomson III. Talar Fractures and Dislocations: A Radiologist’s Guide to Timely Diagnosis and Classification. (2015) RadioGraphics. doi:10.1148/rg.2015140156