The weather gradually turns cold in autumn and winter, and some people begin to appear inexplicable pain around the joints in this reminder do not forget the “femoral head necrosis”, if in the early onset of femoral head necrosis can be found, it is very helpful for treatment. However, most people do not understand the early symptoms of femoral head necrosis, the following is an introduction to the early symptoms of femoral head necrosis: Symptoms of femoral head necrosis 1, early symptoms of femoral head necrosis: pain The early stage of ischemic necrosis of the femoral head can have no clinical symptoms, but is found when taking x-rays. The earliest symptom is hip or knee pain. The pain may be constant or intermittent. Gradually or suddenly there is pain, dull pain or soreness and discomfort in the hip or knee, often radiating to the groin area or the posterior or lateral side of the hip, or the medial side of the knee, and there is numbness in this area. 2, early symptoms of femoral head necrosis: joint stiffness and activity limitation Early patients have normal or slight loss of hip joint activity, manifested as impaired activity in a certain direction, especially internal rotation. It should be detected by flexion, extension, adduction, abduction and internal rotation examination in the 90′ position of hip extension and hip flexion in the horizontal position and knee flexion, and bilateral comparison. 3, early symptoms of femoral head necrosis: claudication, early patients can have intermittent claudication due to increased pressure in the femoral head, which improves after rest, and late patients can have persistent claudication due to femoral head collapse and hip subluxation. Patients with osteoarthritis often have claudication due to pain and morning stiffness, and claudication is aggravated in late stage due to flexion, external rotation and internal deformity. These contents are a brief introduction to the early symptoms of osteonecrosis of the femoral head. If you have these symptoms, you must seek medical attention in time and follow medical advice. The following is a brief introduction to the prevention of femoral head necrosis, what are the methods? 1, how to prevent femoral head necrosis: the femoral neck fracture using strong internal fixation, while the application of bone graft with vascular bone flap head, promote the healing of the femoral neck, increase the blood flow of the head, to prevent osteonecrosis, postoperative follow-up should be regular, appropriate oral promotion of blood flow of Chinese medicine and calcium, to prevent the occurrence of ischemic femoral head. 2, how to prevent femoral head necrosis: because of related diseases must apply hormones, to master the principle of short-term appropriate amount, and with vasodilator drugs, vitamin D, calcium, etc., do not do not listen to medical advice on their own, the abuse of hormonal drugs. 3, how to prevent osteonecrosis of the femoral head: should change the bad habits of long-term alcohol abuse or quit drinking, get out of contact with the environment of pathogenic factors, remove the chemical toxicity of alcohol and prevent the absorption of sprinkles. 4, how to prevent femoral head necrosis: occupational factors such as deep water divers, high-altitude pilots, high-pressure work environment should pay attention to labor protection and improve working conditions, those who have been sick should change the work species and timely medical treatment. 5, how to prevent necrosis of the femoral head: diet should be done: do not eat chili, do not drink alcohol in excess, do not eat hormonal drugs, pay attention to increase the intake of calcium, eat fresh vegetables and fruits, more sunshine, prevent weight bearing, regular activities, etc. on the femoral head necrosis have a preventive effect.