Femoral neck fracture is a fracture of the femoral neck due to osteoporosis, degeneration of the periprosthetic muscle groups in the elderly, unresponsiveness or severe trauma. Femoral neck fracture often occurs in the elderly, the main symptoms are joint swelling and pain, hip flexion and knee flexion and external rotation deformity, linear fracture, etc. The X-ray examination is especially important for linear fracture or insertion fracture, and it is indispensable for the classification and treatment of fracture. Therefore, if a fracture of the femoral neck is clinically suspected, although the fracture line is not seen on the X-ray, it should be treated as an embedded fracture and reviewed on film after 3 weeks. Pay attention to the hip examination. Bone and joint radiographs of the extremities Bone and joint radiographs of the extremities are taken of the extremities and related joints to confirm the bone condition after fracture. Follow the doctor’s instructions. There is no need to panic about X-rays. The patient should be exposed to a safe amount of 100 roentgens or less during the X-ray examination, and the number and duration of permissible exposures should be worked out according to this amount. Ellis sign Ellis sign is to check the height of the top of the knee, this sign is mainly seen in hip dislocation, also seen in femoral neck fracture. The Ellis sign is the bending knee and foot test with the patient lying on his back, both hips and knees flexed, the soles of the feet placed on the bed, the two heels together, the normal top of the two knees should be equal in height, if one knee is lower than the other knee is positive. It is often used to diagnose congenital hip dislocation in pediatric patients.