The early symptoms of osteonecrosis are not obvious, but if detected early and cured in time, the results can be very good. It is important to note that the early symptoms of osteonecrosis of the femoral head are very inconspicuous and can easily lead to misdiagnosis or neglect. Due to the slow onset of femoral head necrosis, the easy to ignore causes (such as hormones, etc.), the atypical early localization symptoms and signs, and especially the low vigilance of doctors, many outpatients have been seen several times or even for several months until the localization symptoms and signs appear and the femoral head has collapsed and deformed before they are diagnosed. According to statistics, more than 70% of patients with osteonecrosis of the femoral head have experienced misdiagnosis. The three main symptoms of femoral head necrosis are hip (unilateral or bilateral) pain, claudication, and dysfunction). Since the only symptom in the early stage is pain, it is often misdiagnosed as sciatica, lumbar disc bulge (prolapse), pear-shaped muscle syndrome, knee osteoarthritis, rheumatism, etc. When ischemic necrosis occurs in the femoral head, it leads to a variety of pains due to aseptic inflammation and increased pressure in the bone marrow and joint cavity, and the surrounding tissues and nerves are stretched and squeezed. In the early stage, i.e., the acute stage, radiating pain along the sciatic nerve may occur posteriorly, and radiating pain along the femoral nerve and adductor muscle may occur forwardly (patients often mistake it for knee pain). In the middle and late stages, vague pain, dull pain, swelling pain and pins-and-needles pain in the hip joint are the main symptoms. Clinically, patients with back and leg pain, especially patients with posterior hip radiating pain and knee pain, often ignore hip disorders and conventional pelvic orthopantomographs do not easily detect microscopic changes in X-rays, which are two common cases of femoral head necrosis misdiagnosis and missed diagnosis. Improve the early diagnosis rate of femoral head necrosis 1. Deep pressure pain in the groin area, deep pressure pain behind the hip, heel percussion hip conduction pain and “4 word sign” can help early diagnosis. 2.After early diagnosis, intramedullary decompression of the femoral head and other integrated Chinese and Western medicine treatments can be performed in time to reduce the collapse and deformation of the femoral head and protect the function of the hip joint. 3.For patients who present themselves with complaints of low back and leg pain, positive and lateral x-ray of the hip joint should be taken as a routine examination. Widening of the medial joint space, increased density of the top of the femoral head and hypertrophy of the joint capsule (the outer edge of the capsule shadows arcing outward) are the three main features of early X-ray performance of femoral head necrosis. 4. Carefully ask if there is any history of high-dose hormone application, history of alcohol consumption, hyperlipidemia, trauma and other induced osteonecrosis. Early diagnosis of femoral head necrosis is especially important, and patients should choose experienced doctors.