Qinghai University School of Medicine Integrated Traditional Chinese and Western Medicine Hospital Co., Ltd.

The study is conducted in the affiliated hospital of Qinghai University .Patients in the department of Critical Care Medicine and Emergency Intensive Care Unit will be eligible for inclusion if they meet the Berlin criteria.Two researchers assess pulmonary artery pressure and right heart function of patients who are enrolled.

This study will investigate the effects of implantation of cemented femoral stem versus percutanous internal fixation with cannulated compression screws on hip joint function recovery, pains, femoral head collapse and sterile prosthesis loosening, peri-prosthesis infection, and the histocompatibility of prosthesis material with host tissue in the elderly patients with osteoporotic fracture of proximal femoral neck complicated by avascular necrosis of the femoral head, which will provide scientific evidence for selecting surgical methods and internal fixation/artificial prosthesis material for osteoporotic fracture of proximal femoral neck in the elderly patients.

To assume that lumbar plexus-sciatic nerve block combined with sevoflurane can effectively diminish the incidence of cognitive dysfunction in elderly patients after hip arthroplasty.