Fracture Complications: Avascular Necrosis Risk

Avascular necrosis (AVN) is the death of bone tissue due to a lack of blood supply. Certain fractures, especially those involving bones with limited blood supply or disrupting major vessels, are at higher risk for developing AVN.

Analyzing Fracture Sites and AVN Risk

Let's examine the risk of AVN for each listed fracture:

• Fracture of the scaphoid: The scaphoid bone has a precarious blood supply. Proximal pole fractures, in particular, have a significant risk of AVN because the blood supply often enters distally.
• Subcapital fracture of the femoral neck: These fractures commonly disrupt the blood vessels (e.g., retinacular arteries) supplying the femoral head. This disruption leads to a high incidence of AVN.
• Fracture of the calcaneum: The calcaneum generally receives a robust blood supply from multiple arterial sources. While severe fractures can cause local issues, AVN is a relatively uncommon complication compared to other sites.
• Fracture of the talus: The talus, particularly its neck and dome, has a limited and easily compromised blood supply. Neck fractures are well-associated with a high risk of AVN.

Based on the vascularity of the affected bones, the fracture least likely to result in avascular necrosis is the fracture of the calcaneum.