The most difficult fractures to heal are the navicular fracture of the wrist, the talus fracture of the ankle, the middle and lower third of the lower leg and the femoral neck fracture. 1. Fracture of navicular bone of wrist joint: Navicular bone of wrist joint is a special bone with poor blood supply, which makes it easy to have a fracture that is difficult to heal, or even non-healing or necrosis. 2. Talus fracture of ankle joint: the blood supply of ankle joint mainly comes from the anterolateral part of the neck of talus and passes the blood to the articular branch of dorsalis pedis artery, so the talus fracture will easily lead to ischemic necrosis of talus if the fracture is dislocated or dislocated. 3. Middle and lower third of the lower leg junction: the middle and lower third of the lower leg junction has poor blood supply, the soft tissues and muscles in this area are relatively less, and the blood supply is poor, so it is easy to cause the fracture site to be difficult to heal or non-healing symptoms. 4. Femoral neck fracture: blood circulation is poor in the femoral neck, so the healing rate is lower than other parts of the fracture. Fractures need to go to the orthopaedic department of the hospital in time to find a professional doctor for treatment, and then stay in bed to recover and have regular checkups.