Following is an example of avascular necrosis that can occur after trauma. The patient, 53 years old male, suffered fracture neck femur and was operated for the same using cancellous cannulated screws about 7 months prior to this xray.

He presented to OPD with pain in the involved hip and the xray revealed following picture.

Avascular Necrosisof Femoral Head With Cancellous Screws In Situ

The fracture neck femur has united but there is increased radiodensity of the head along with collapse of superomedial portion of the head thus indicating that patient has avascular necrosis of the head of femur.