['Femoral neck fractures are a major public health problem. Multiple-screw fixation is the most commonly used surgical technique for the treatment of stable femoral neck fractures.', 'We determined (1) the proportion of hips that had conversion surgery to THA, and (2) the proportion of hips that underwent repeat fracture surgery after percutaneous screw fixation of stable (Garden Stages I and II) femoral neck fractures in patients older than 65\xa0years and the causes of these reoperations.', 'We performed a retrospective study of all patients older than 65\xa0years with stable femoral neck fractures secondary to low-energy trauma treated surgically at our institution between 2005 and 2008. We identified 121 fractures in 120 patients older than 65\xa0years as stable (Garden Stage I or II); all were treated with percutaneous, cannulated screw fixation in an inverted triangle without performing a capsulotomy or aspiration of the fracture hematoma at the time of surgery. The average age of the patients at the time of fracture was 80\xa0years (range, 65-100\xa0years). Radiographs, operative reports, and medical records were reviewed. Fracture union, nonunion, osteonecrosis, intraarticular hardware, loss of fixation, and conversion to arthroplasty were noted. Followup averaged 11\xa0months (range, 0-5\xa0years) because all patients were included, including those who died. The mortality rate was 40% for all patients at the time of review.', 'Twelve patients (10%) underwent conversion surgery to THA at a mean of 9\xa0months after the index fracture repair (range, 2-24\xa0months); the indications for conversion to THA included osteonecrosis, nonunion, and loss of fixation. Two others had periimplant subtrochanteric femur fractures treated by surgical repair with cephalomedullary nails and two patients had removal of hardware.'] Does revision surgery occur frequently after percutaneous fixation of stable femoral neck fractures in elderly patients?