Spinal Versus General Anesthesia on Postoperative Pulmonary Complications

Inclusion Criteria: * Patients ≥ 65 years old * ASA Class I \~ III * Surgical repair of femoral neck, intertrochanteric or subtrochanteric fractures * The time from diagnosis to surgery is more than 48 hours Exclusion Criteria: * Unable to walk about 3 meters or across a room without assistance before the fracture * Emergency surgery * Congestive heart failure, asthma, anemia (Hb \< 90 g/L), hypoalbuminemia (ALB \< 35g/L) * Abnormal coagulation function * Severe aortic stenosis * Injection site infection or increased intracranial pressure * Patients have participated in previous trials or have been determined by a surgeon or anesthesiologist to be unsuitable for randomization * The written informed consent of the patient or his/her representative cannot be obtained