We report a patient with previous history of long-term bisphosphonate intake who suffered the fracture of both femurs consecutively. The radiological characteristics of both fractures allowed to catalog a posteriori of atypical fractures associated with the prolonged treatment with bisphosphonates. Atypical fractures represent an entity of recent definition that in the last years have attracted considerable attention due to the publication of an increasing number of cases. The aim of this paper is to emphasize the importance of its clinical suspicion before they appear and the characteristics of this type of fractures to provide the most appropriate clinical and surgical treatment.