Comparison of the analgesic effect of ultrasound-guided femoral nerve block and iliofascial lacuna block after total knee arthroplasty

Abstract

Objective To compare the analgesic effect of ultrasound-guided femoral nerve block and iliofascial lacuna block after total knee arthroplasty. Methods From June 2016 to June 2018, 96 patients with total knee replacement in Orthopaedic Hospital of Yongkang were selected in this research and divided into two groups by random number table method, with 48 cases in each group.The control group was treated with ultrasound-guided femoral nerve block, and the observation group was treated with ultrasound-guided iliofascial lacuna block.Visual analogue (VAS) pain score, puncture injection time, cumulative fentanyl dosage, recovery time, effective analgesia time, active joint flexion angle and adverse reactions of the affected limb were compared between the two groups at 4 h, 8 h, 12 h, 24 h and 48 h after surgery. Results There were no statistically significant differences in VAS score at each postoperative time point between the two groups (all P>0.05). At 4 h, 8 h, 12 h and 24 h after surgery, the VAS scores in the observation group [(2.16±0.58) points, (2.03±0.52) points, (1.94±0.47) points, (1.86±0.51) points] were significantly lower than those in the control group [(2.55±0.63) points, (2.46±0.61) points, (2.31±0.55) points, (2.17±0.58) points] (all P 0.05). The effective analgesic time, limb active joint flexion angle at 24 h, 48 h after operation in the observation group[(39.17±3.52)h, (47.99±4.78)°, (68.97±4.13)°] were significantly higher than those in the control group[(27.34±1.23)h, (30.12±4.68)°, (45.52±3.87)°], the differences were statistically significant (all P<0.05). After treatment, all patients had complications such as nausea and vomiting, pruritus, and hematoma at the puncture point.The total incidence of the observation group(4.17%) was lower than that of the control group (16.67%), the difference was statistically significant (χ2=4.019, P<0.05). Conclusion Ultrasound-guided iliac fascial space block analgesia is significantly better than femoral nerve block in total knee replacement patients, which can effectively reduce pain and adverse reactions. Key words: Arthroplasty, replacement, knee; Anesthesia; Ultrasonography; Femoral nerve; Fascia; Pain