For the fixation of trochanteric fractures, the dynamic hip screw (DHS) implant system has been designed. It can also be used for certain subtrochanteric fractures as well as for selected basi-cervical femoral fractures. The implant is based on the sliding nail principle which allows impaction of the fracture. This is done by the insertion of a wide diameter screw into the femoral head. A side plate, which has a barrel at a fixed angle is slid over the screw and fixed to the femoral shaft. The barrel and the screw each have two matching flats, thus allowing the smooth shaft of the screw to slide within the barrel yet retain rotational stability. The femoral head fragment fixed with the screw can be impacted, either deliberately or from weight-bearing.