Patients with femoral neck fracture often have mild hip flexion and knee flexion and external rotation deformity. Neck of femur fracture often occurs in the elderly, as people live longer, its incidence increases day by day, with the 50-70 years old people as the most common. What are the symptoms that are easily confused with it? 1, intertrochanteric fracture Intertrochanteric fracture, also known as intertrochanteric fracture, refers to the fracture of the base of the femoral neck to the plane of the lower part of the lesser trochanter, and is an extracapsular fracture. It is most common in people over 65 years old, and is more common in women than in men. Due to the rich blood flow in the lesser trochanter, the fracture rarely fails to heal, but it is very prone to hip inversion. Complications caused by prolonged bed rest are more common in elderly patients. Ischemic necrosis of femoral head Ischemic necrosis of femoral head, also known as necrosis of femoral head, is a common intractable disease in orthopedic field, in which the blood supply of femoral head is interrupted or impaired, which causes the death of bone cells and bone marrow components and their subsequent repair, and then results in the structural changes of the femoral head, femoral head collapses, and joint dysfunction. This disease can be divided into two categories: traumatic and non-traumatic. The former is mainly caused by hip trauma such as femoral neck fracture and hip dislocation, while the latter is mainly caused by the application of corticosteroids and alcoholism in China. 3, subchondral incomplete fracture This disease is common in overweight women over 60 years of age, due to the reduction of bone volume in the upper outer area of the femoral head, fracture under stress. The main symptom is severe pain in the hip without obvious history of trauma and inability to bear weight. 4.Late rheumatoid arthritis Late rheumatoid arthritis series due to synovial thickening. Vascular cataract formation, and erosion and destruction of cartilage and subchondral bone, eventually leading to joint deformity and ankylosis. Clinically, patients not only have joint pain and swelling, but more importantly, irreversible severe deformity and ankylosis of the joints, or complete loss of function. Joint x-ray examination shows severe destruction of joint structure or bony fusion. Patients in this stage often cannot take care of themselves, have difficulty walking or are bedridden all day.