The undisplaced femoral neck fractures has different methods of treatment. One of the most frequently use technique is percutaneously placed cannulated screws. A devastating but infrequent complication of this techniqueis a subtrochanteric femur fracture after screw fixation. We present 3 cases of this complication, concluding in a low energy traumatism the common aetiology cause and a distal entry point the most frequent risk factor. A suitabletreatment must be taken depending on the femoral neck fracture healing and the general patient conditions. In ourexperience, a total hip arthroplasty, a gamma 3 nail and a unloading actuation, has been the 3 use treatments.A favourable evolution and the return to the march are the common results.

The undisplaced femoral neck fractures has different methods of treatment. One of the most frequently use technique is percutaneously placed cannulated screws. A devastating but infrequent complication of this techniqueis a subtrochanteric femur fracture after screw fixation. We present 3 cases of this complication, concluding in a low energy traumatism the common aetiology cause and a distal entry point the most frequent risk factor. A suitabletreatment must be taken depending on the femoral neck fracture healing and the general patient conditions. In ourexperience, a total hip arthroplasty, a gamma 3 nail and a unloading actuation, has been the 3 use treatments.A favourable evolution and the return to the march are the common results.