There is a relationship between femoral head necrosis and bone marrow edema. Necrosis of the femoral head may be caused by ischemia of the femoral head due to a variety of factors such as trauma, long-term application of hormones, ethanol poisoning, decompression sickness and so on. Patients may have symptoms such as claudication and lower limb shortening deformity. And bone marrow edema is a non-specific pathological phenomenon caused by a variety of bone marrow lesions, mostly secondary changes. Common bone infection, bone trauma, osteoporosis, bone tumor, bone ischemia and other lesions. Since necrosis of the femoral head also belongs to a kind of bone ischemia, the two may have a certain concomitant relationship. It is recommended that patients with necrosis of the femoral head should go to the hospital in time and follow the doctor’s instructions to actively carry out treatment to avoid delaying the condition.