Surgical steps for intramedullary nailing of the femur: First, exposure, including a surgical incision, large enough to generally require a length of five centimeters, is made layer by layer to expose the fracture end. Second, repositioning is performed to gradually restore the fracture from its displaced position to its original position, either anatomically or functionally. Third, the local opening is made, and the reamer is placed into the medullary cavity and enlarged step by step. Fourth, the trial nail is driven into the bone marrow cavity to see if the thickness and length of the main nail are appropriate, and the main nail is placed into the bone marrow cavity to drive the interlocking nail. Fifth, take a film. Sixth, suture the wound.