Intramedullary nails belong to the commonly used clinical orthopedic internal fixation devices and are the preferred internal fixation material for femoral stem fractures. There is no so-called biggest disadvantage of using intramedullary nailing for internal fixation after fracture, and there are possible postoperative complications such as infection, non-union of fracture, fat embolism, displacement or breakage of internal fixation and so on. 1. Infection: orthopedic surgery has the risk of infection, surgical trauma and the implantation of internal fixation materials and other factors are the main factors causing infection, infection can cause local redness, swelling, heat and pain, as well as generalized fever, and severe infections can lead to osteomyelitis and bone nonunion. 2. Fracture non-healing: intramedullary nail fixation requires marrow expansion treatment, which may affect the blood circulation of the fracture broken end, resulting in delayed healing of the medial bone cortex and intramedullary, or even non-healing. 3. Fat embolism: Intramedullary nails, due to marrow expansion treatment, make the bone marrow components into the blood, free fat particles with the blood can reach all parts of the body, such as pulmonary embolism, deep vein embolism of the lower limbs, and so on. 4. Displacement or fracture of internal fixation: due to the failure to carry out correct functional exercise under the guidance of the doctor after the operation, or excessive exercise, it can lead to displacement of intramedullary nails in the body, or even fracture of intramedullary nails. To fix the intramedullary nails after fracture, the professional doctor should make a comprehensive assessment of the condition after various examinations and then determine the treatment plan, and the patient should actively cooperate with the doctor for treatment to promote early recovery.