Treatment The surgical options are both bipolar artificial femoral head replacement. The femoral head is inserted through the Moore approach to the hip, and the posterior joint capsule is dissected longitudinally along the long axis of the femoral neck to reveal the femoral neck, taking care to preserve the entire joint capsule of the hip joint anteriorly and posteriorly. The femoral head was removed, the stump of the femoral neck was trimmed, the medullary cavity was filed, and the femoral stem prosthesis (cemented type in 9 cases and biological type in 4 cases) was implanted at an anterior tilt of about 15°. The joint capsule was repaired in situ after repositioning the hip joint to prevent postoperative dislocation of the artificial femoral head. The joint stability, mobility, lower limb length and the presence of impingement during extreme activities were checked. At the same time, 3-4 small bone holes were drilled in the inter-rotor ridge, and the short external rotator muscle group was sutured to the inter-rotor ridge, and the gluteus maximus fascia and iliac path bundle were firmly sutured to strengthen the soft tissue “support” behind the joint. Postoperative management Postoperative antimicrobial agents were given for 3-7 d to prevent infection and low molecular heparin sodium for 7-10 d to prevent deep vein thrombosis, together with mechanical massage of both lower limbs. The plasma drainage tube was removed 2-3 d after surgery according to the plasma drainage flow. After surgery, the lower limbs on the operated side were kept in abduction and rotation neutral position to prevent the artificial femoral head from prolapsing. Gradually practice turning, sitting, getting out of bed, standing and walking activities 3-14 d after surgery, with the healthy side first when walking. After discharge from the hospital, patients were instructed not to sit on a low stool and not to stilt their legs as much as possible, and not to flex the hip more than 90° within 6 weeks, and not to flex the hip more than 120° after 6 weeks. Follow-up visits and radiographs were taken at 3 months, 6 months, 1 year and annually thereafter to understand the condition of the prosthesis. There are many criteria for evaluating hip function, including the Harris Hip Efficacy Scoring System, the Charnley Hip Efficacy Score, the 1982 Beijing Protocol, the Mayo Total Hip Arthroplasty Efficacy Score and the functional score after hip trauma, etc. Each criterion has different reasonable and unreasonable aspects, but the common points mainly include three aspects: pain, function and joint mobility. Since there is no specific evaluation standard for this type of patients, the existing evaluation standards have many unreasonable aspects for this type of patients, and the various evaluation standards are not ideal for this type of patients because they already have serious deficiencies in three aspects: pain, function and joint mobility before the injury. In contrast, we chose the most widely used Harris hip efficacy scoring system to assess preoperative and postoperative hip function, and it is debatable whether it is reasonable.