Effect of Repetitive Transcranial Magnetic Stimulation on Postoperative Pain in Patients Undergoing Lower Extremity Fracture Surgery: A Single-Center, Randomized Controlled Trial

INTERVENTION: Repetitive Transcranial Magnetic Stimulation Group:Repetitive Transcranial Magnetic Stimulation;Control group:Repetitive Transcranial Magnetic Stimulation Sham Stimulation; CONDITION: postoperative pain PRIMARY OUTCOME: Weighted AUC pain score at rest at 48 hours postoperatively; SECONDARY OUTCOME: Incidence of postoperative chronic pain;Quality of Recovery score ;Total morphine milligram equivalents (MME) at 48 hours postoperatively;Number of effective PCIA pump demands and total number of pump demands;Postoperative sleep quality score;Pain score during movement;Resting pain score; INCLUSION CRITERIA: 1.Aged >= 18 years old; 2.ASA grade I‐III; 3.Unilateral femoral or tibial and fibular fracture scheduled for elective open reduction and internal fixation under general anesthesia; 4.Able to cooperate with the trial protocol and correctly understand all evaluation items, voluntarily participate and sign the informed consent form;