Closed intramedullary nailing has become increasiagly popular in the management of fracture of the femur because of a high rate of union and a low rate of complications. Since the development, it has been widely used in more applicable level of femoral shaft fracture. Therefore, complications of intramedullary nailing was rarely seen. especially rare in case of fractures of the femoral neck associated with technical errors. The three cases of femoral neck fracture with technical errors during intramedullary nailing for treatment of femoral shaft fracture in Paik Hospital, Pusan from April l994 to July l995 are reported herein to document that this complication can occur. Three cases of the femoral neck fracture were treated by closed reduction and internal fixation with Knowles pin.