Femoral head necrosis is a common orthopedic disease, but its late treatment is less effective, so we need to understand its early symptoms so that we can cure it completely. Early symptoms of femoral head necrosis are usually pain, which often occurs in the groin and also in the hip of some patients. The lower limbs may feel weak, even numb and sore. Patients with more severe disease are usually unable to walk, have muscle atrophy or even paralysis. You can use the following two methods to test whether you have osteonecrosis of the femoral head. Deep pressure method: All patients with early femoral head necrosis will have deep pressure pain in the affected groin, which will be painful if you apply deep pressure to the groin with your hand. ”4″ sign test: the patient lies on his back, the patient bends the knee and hip of one lower limb and puts the heel on the contralateral knee, check one hand holds the knee of the bent leg, the other hand presses on the contralateral iliac crest, both hands press down at the same time. When the pressure is applied, the sacroiliac joint pain indicates a lesion of the sacroiliac joint. Since the early symptoms of femoral head necrosis are not very obvious, it is easy to ignore this disease, and sometimes there is misdiagnosis, so it is recommended to find this disease early and treat it early.