Subtrochanteric fractures of the femur can be treated by sliding hip screw devices. We encountered a subtrochanteric fracture in a 43 years old male. Open reduction and fixation with a sliding hip screw and plate were performed. One week later, the sliding screw disengaged from the side plate. In the operating room, the side plate was changed to the long barrel type and a compression screw was inserted. At two year follow-up, the fracture was united with good function.