ObjectiveTo investigate the efficacy of ultrasound-guided combined femoral nerve-lateral popliteal fossa sciatic nerve block in the elderly patients with diabetes mellitus during the surgery of knee joint and the parts below. MethodsForty elderly patients with diabetes mellitus who needed the surgery of knee joint and the parts below were enrolled, and were randomly divided into group A and group B, with 20 cases in each group. Group A received ultrasound-guided combined femoral nerve-lateral popliteal fossa sciatic nerve block, and group B received intraspinal anesthesia. At 4 time points (T0, T1, T2 and T3), the mean arterial pressures (MAP), heart rates(HR) and Visual Analogue Scale (VAS) scores were compared between the two groups. ResultsThere were no significant differences in the MAP and HR at T0 between the two groups(P＞0.05). At T1-T3, the MAP and HR of group were significantly higher than those of group A（P＜0.05）. The duration for postoperative first ambulation in group B was significantly longer than that in group A［（3.96±0.67）d vs. (2.12±0.45)d, P＜0.05］. ConclusionUltrasound-guided combined femoral nerve-lateral popliteal fossa sciatic nerve block is suitable for all kinds of surgery of knee joint and the parts below in the elderly diabetic patients, does not cause nerve trunk damage, anesthetic sequelae and complications, and is worthy of clinical promotion and application.

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