1.Which patients are suitable for hip joint replacement? (1) Patients with osteoarthritis and rheumatoid arthritis of the hip joint, who have been treated with strict conservative treatment and are suffering from significant pain, dysfunction and significant joint space narrowing. (2) Patients with ischemic necrosis of the femoral head resulting in collapse of the femoral head and osteoarthritis of the hip joint with pain and impaired movement. (3) Patients with ankylosing spondylitis, old joint tuberculosis, trauma and other causes of hip joint ankylosis, which affects life and work. (4) Elderly people with displaced femoral neck fractures of subhead type or transcervical type. (5) Certain bone tumors involving the hip joint. 2.How to diagnose and treat femoral head necrosis? Bacterial infection (such as osteomyelitis, bone tuberculosis, septic arthritis) and ischemia (such as trauma, alcohol, hormones, etc.) can cause osteonecrosis. If osteonecrosis occurs in the femoral head area, it is called osteonecrosis of the femoral head. Clinical symptoms of osteonecrosis of the femoral head are pain in the groin, hip and thigh area and limited internal rotation of the hip joint. Based on the medical history and clinical symptoms, combined with magnetic resonance imaging (MRI), early-stage femoral head necrosis can be diagnosed, while femoral head necrosis that can be definitively diagnosed by X-ray is usually an intermediate or advanced lesion. Reduction of weight bearing, use of non-steroidal drugs and physical therapy, proper medullary decompression, and scraping surgery of necrotic bone can be used to treat early stage femoral head necrosis and delay joint replacement. For intermediate and advanced lesions, artificial hip replacement is the only method that can obtain long-term results. 3.What is acetabular dysplasia? Acetabular dysplasia is a kind of hip deformity formed by the developmental disorder of the acetabulum, which is more common in women. The main pathological changes are the shallow acetabulum, resulting in insufficient acetabular inclusion and coverage of the femoral head, which leads to abnormal hip joint mechanical conduction, gradually causing damage and degeneration of the articular cartilage and eventually leading to osteoarthritis of the hip joint. Acetabular dysplasia is a disease with a high disability rate. Early acetabular dysplasia has no obvious clinical symptoms, so it is not easy to diagnose early. With the growth of age, the symptoms gradually appear around 20-40 years old, initially manifesting as hip soreness and discomfort, aggravated after long standing or walking for a long time, and improving after rest. Then hip pain appears, mainly in the root of the thigh and groin area, sometimes accompanied by knee pain. In the early stage, there is no obvious obstacle to hip joint activity. As the disease progresses, hip pain further worsens and hip joint activity is affected, and the patient develops claudication or even scoliosis. The younger the age at which the symptoms appear, the more severe the acetabular dysplasia is and the worse the prognosis. The diagnosis of acetabular dysplasia can be confirmed by taking an x-ray of the hip joint. 4.What is the cost of hip replacement? How many days of hospitalization? The total hospitalization cost of hip replacement ranges from 20,000 to 50,000, depending on the type of prosthesis chosen. The general hospital stay is about 7 days. 5.What should I pay attention to after hip replacement? The early functional rehabilitation and exercise after hip replacement (within three months) is based on the strength training of the muscles around the hip joint and joint mobility exercise, especially the gluteus medius muscle of the abductor hip joint and the gluteus maximus muscle of the posterior extensor hip joint, the strength of which directly affects the walking gait and joint stability in the later stage. After hip replacement surgery, patients need to pay special attention to the change of living habits, such as not squatting, not excessive internal and external rotation of the hip joint, not crossing the legs, etc., especially in the first three months after surgery, improper posture may cause dislocation of the hip joint. 6.How long can hip prosthesis be used? In the absence of complications (infection, dislocation, etc.), the survival rate of the hip prosthesis is over 95% at 10 years and over 90% at 20 years. In addition, the more wear-resistant the interface (ceramic-ceramic, metal-metal), the longer the service life.