ObjectiveTo explore the analgesic effect of continuous femoral nerve block (CFNB) guided by ultrasound in patients with patellar fracture. MethodsNinety-eight patients with unilateral patellar fracture were randomly divided into observation group and control group,49 cases in each group.The patients of control group received patient-controlled intravenous analgesia (PCIA) after operation, and the patients of observation group were given CFNB-guided by ultrasound. ResultsThe resting VAS socres of 8h, 12h, 24h and 48h after operation in the observation group were significantly lower than those of the control group (P＜0.05). And the VAS score during function exercise of the observation group was significantly lower than that of the control group (P＜0.05). The four femoral muscle strength of the observation group 4 hours after operation was significantly weaker than that of the control group (P＜0.05). There was no significant difference of the muscle strength between two groups at other time points (P＞0.05). The limb active flexion angle of 24h, 36h, 48h after operation in the observation were significantly higher than those in the control group (P＜0.05). The incidence of adverse reactions in the control group(42.86%) was significantly higher than that in the observation group(6.12%) (P＜0.05). The score of patients satisfaction in the observation group was significantly higher than that of the control group(P＜0.05). ConclusionsThe effect of CFNB on postoperative analgesia of patellar fracture is exact, shows of the advantages of little influence on the muscle strength, effective postoperative pain relief, low incidence of adverse reactions, and high level of patient satisfactionl.

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