Inclusion Criteria:  American Society of Anesthesiologists (ASA) physical status I-III Aged over 60 years Anesthesia induction with rocuronium as NMBAs, maintenance with volatile sevoflurane Scheduled to undertake joint surgery Signed the informed consent form  Exclusion Criteria:  Those with a history of hepatic or renal disease, chronic or acute alcoholism, allergy or hypersensitivity to sugammadex or neostigmine, current medication with effects on the central nervous system, a history of dysfunction of neuromuscular system Those with diaphragm insufficiency or massive pleural effusion Women who are pregnant or nursing Those undergoing upper abdominal laparotomy, after which we cannot obtain a satisfactory ultrasound imaging or do not have space for placement of ultrasonic probe Declined to participate