BackgroundLiposomal bupivacaine (LB) provides prolonged postoperative analgesia. This study aimed to evaluate the analgesic efficacy of erector spinae plane block (ESPB) using LB in patients undergoing spinal surgery.MethodsA total of 64 patients undergoing elective spinal surgery were randomly assigned in a 1:1 ratio to receive ESPB with 0.44% liposomal bupivacaine (LB group) or 0.4% ropivacaine (RH group) for postoperative pain management. The primary outcome was the incidence of rescue analge