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Radiographs show atypical subtrochanteric stress fracture of the right proximal femur diaphysis in a 65-year-old woman who underwent treatment for 5 years with alendronate. (a) Note the focal periosteal reaction with cortical thickening of the right lateral femoral diaphysis with subtle fracture line (arrow). (b) Image demonstrates protective internal fixation of the fracture with a long gamma nail.
