Early diagnosis of femoral head necrosis can be judged by clinical symptoms and imaging performance, as follows: First, clinical symptoms: early femoral head necrosis, patients will have intermittent pain symptoms in the hip joint, the location of the pain is mostly located in the midpoint of the inguinal ligament and the hip, sometimes can be dissipated to the inner thigh and front, the patient will have limited movement of the hip joint, mainly flexion activity is limited, internal and external rotation activity is limited. The patient will have limitation of hip movement, mainly limitation of flexion and internal and external rotation. Second, imaging performance: early MRI scan can reveal necrosis inside the femoral head, and local bone marrow edema is obvious. After the comprehensive judgment of the above methods, early ischemic necrosis of the femoral head can be diagnosed, and untimely treatment will prolong the course of the disease, thus further delaying the adoption of arthroplasty.