Abstract:Objective To compare the effects of combined spinal-epidural anesthesia and combined femoral and lateral femoral cutaneous nerve block on postoperative analgesia and coagulation function among elderly patients with lower limb fractures.Methods A total of 96 elderly patients with lower limb fractures treated at Shaanxi Provincial Corps Hospital, Chinese People's Armed Police Force between March 2022 and March 2025 were enrolled and divided into a control group and a combined group according to different treatment modalities (48 patients in each group). Combined spinal-epidural anesthesia was administered in the control group, whereas femoral nerve block combined with lateral femoral cutaneous nerve block was administered in the combined group. Postoperative analgesic efficacy, coagulation indices, hemodynamic parameters, anesthetic features, and adverse event rates were compared between the two groups.Results There were statistically significant differences in visual analogue scale (VAS) scores at different time points (P < 0.05). The group effect showed significant differences between the combined group and the control group (P < 0.05), and a significant interaction between time and group was observed (P < 0.05). The pre- to postoperative changes in prothrombin time (PT), activated partial thromboplastin time (APTT), and fibrinogen (FIB) were greater in the control group than in the combined group (P < 0.05). For mean arterial pressure (MAP) and heart rate (HR), significant differences were observed at different time points (P < 0.05). The group effects were statistically significant (P < 0.05), and significant interactions between time and group were also found (P < 0.05). The onset time of sensory block, onset time of motor block, duration of sensory block, and duration of motor block were all longer in the combined group than in the control group (P < 0.05). No significant difference was observed in the total incidence of adverse reactions between the two groups (P > 0.05).Conclusion Combined femoral and lateral femoral cutaneous nerve block provides effective postoperative analgesia, with less impact on postoperative coagulation-related indicators and good safety profile, and has clinical utility.