In the absence of special circumstances (such as abnormal blood coagulation function or other factors that will affect spinal anesthesia, such as lumbar diseases), we usually recommend that patients use spinal anesthesia (also known as "semi-anesthesia") in short-term lower limb surgery, because compared with general anesthesia, spinal anesthesia can usually make patients recover faster, and it can last for a certain period of time after surgery, and the cost is lower. However, when there are related anesthesia contraindications or patients can not clearly cooperate with the operation, general anesthesia should be carried out.