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a Case 2. Preoperative X-rays of a periprosthetic fracture of the right knee in a 62-year-old woman. b A radiograph of refracture at the tip of the retrograde nail taken 3 months later after the RISN fixation. c Follow-up radiograph taken 2.5 years later after fracture fixation with a femoral intramedullary nail showing callus formation
