In medicine, osteonecrosis of the femoral head is the most common orthopedic disease, not only the causes are complex and diverse but also the slightest inattention in life can lead to the occurrence of osteonecrosis of the femoral head. It is evident that many people do not understand the causes of osteonecrosis of the femur, so timely understanding of the causes of osteonecrosis of the femur can reduce the occurrence of the disease. So what are the common causes of femoral head necrosis? 1, trauma. Trauma is one of the main reasons for the occurrence of femoral head necrosis. In life, such as frequent external impact caused by femoral neck fracture, hip dislocation, hip joint sprain and contusion. However, the occurrence and extent of traumatic ischemic necrosis of the femoral head mainly depends on the degree of vascular destruction and the compensatory capacity of the collateral circulation. 2. Hormonal drugs. The occurrence of femoral head necrosis is directly related to the type, dosage form and route of administration of hormones, which is not proportional to the total amount and time of hormones. But the long-term use of hormones or excessive daily dose, dose increase or decrease sudden change is also one of the reasons for the occurrence of femoral head necrosis. For example, long-term use of hormone drugs due to bronchitis, asthma, rheumatism, rheumatoid, neck, shoulder, back and leg pain, diabetes, skin disorders, etc. Due to the large amount or long-term use of hormones, resulting in the accumulation of hormones in the body and the onset of disease. 3, alcohol stimulation. The accumulation of alcohol in the body as a result of long-term heavy drinking leads to the increase of blood lipids and damage to liver function. The increase of blood lipid causes the increase of blood viscosity, slowing down the blood flow and changing the coagulation of blood, thus blocking the blood vessels, bleeding or fat embolism and causing osteonecrosis. 4, congenital hip dislocation. Clinical manifestations are walking duck step, short lower limbs, muscle atrophy, line about 50 meters of pain gradually aggravated, functional limitations, etc. 5, some other diseases: such as: chronic liver disease, lupus erythematosus, pancreatitis, hyperlipidemia, ventilation, etc. The above is the introduction of common triggers of femoral head necrosis. Through the above introduction we can understand the occurrence of osteonecrosis of the femoral head to the patient’s damage is great, so in life, as long as the understanding of the causes of osteonecrosis of the femoral head Some can be timely and effective to avoid the occurrence of osteonecrosis of the femoral head disease. If you are inadvertently already suffering from osteonecrosis of the femoral head, you need to go through regular treatment to relieve your pain. In early stages of osteonecrosis, bone marrow mesenchymal stem cell therapy is available. In advanced cases of osteonecrosis, especially if you are older than 60 years old, you will need to undergo an artificial joint replacement.