Subtrochanteric femoral insufficiency fractures related to the use of long-term bisphosphonates: a pictorial review.

Sub-trochanteric femoral fractures as a complication of long standing bisphosphonate therapy are rare. Drug regulatory authorities like MHRA in the UK (Medicines and Healthcare products Regulatory Agency) have recently alerted specialists about this complication. We describe and illustrate the plain radiographic, CT and MRI features and emphasize the role of imaging in the accurate diagnosis of this new type of insufficiency fractures. There is paucity of radiology literature on this topic and hence awareness of the typical imaging features helps to prevent misdiagnosis and delayed treatment. Our patients were on bisphosphonates (alendronate) for more than 3 years duration and presented with anterolateral thigh pain to the emergency department.