Feasibility of Implantation of Cemented Femoral Stem for Osteoporotic Femoral Neck Fracture in Elderly Patients

Inclusion Criteria: * Patients with avascular necrosis of the femoral head diagnosed according to the previous criteria: Bone nonunion as indicated by a clear fracture line on X-ray images 12 months after femoral neck fracture; cystic degeneration, sclerosis, and uneven density on X-ray images and CT scans * Patients with osteoporosis diagnosed according to a previous report: Bone density T value \< -2.5 or bone mass decrease by 25% * Patients with femoral neck fracture diagnosed according to the previous criteria (Chen and Wang, 2013): Presence of a fracture line on anterior- posterior X-ray images of the hip joint, and CT and MRI examination in combination with clinical symptoms and physical sign are necessary if no fracture line appears * Age 60-80 years * Healthy and able to tolerate anesthesia and surgery * Provision of informed consent about participation and trial procedure Exclusion Criteria: * Alcohol abuse or long-term use of hormone drugs * Infection of tissue around the hip joint * Bone metabolism disorders other than osteoporosis, such as renal osteodystrophy and osteomalacia * Heart, lung, brain, or other systemic diseases * Advanced malignant tumor * Recent cerebral hemorrhage, myocardial infarction, or failure of important organs * Injured limb with deep venous thrombosis * Inability to tolerate surgery