[Modified dynamic hip screw implant in pathologic fracture of the femoral neck (juvenile bone cyst)].

Pathological fractures of the neck of the femur during adolescence should be treated in order to maintain the original length of the femoral neck. The available implants are designed as sliding nail plates and therefore are not capable of blocking collapse of the neck in the presence of a cystic lesion. By loading the unthreaded part of the Dynamic Hip Screw by segments of tubes the gliding mechanism is locked. The hip screw modified in this way can secure anatomic healing of the femoral neck.