Efficacy of Different Local Anesthetic Concention of Ropivacaine in Patient Receiving Continuous Femoral Nerve Block for Postoperative Rehabilitation Pain after Total Knee Arthroplastic Surgery

Objective:To evaluate the efficacy of different concentration of ropivacaine in patient receiving continuous femoral nerve block for postoperative rehabilitation pain after total knee arthroplastic surgery.Methods:Sixty ASAⅠorⅡ patients aged 40-80yr undergoing unilateral total knee arthroplastic(TKA) surgery were randomly allocated into 2 groups(n=30 each),the high concentrion(0.25%ropivacaine) group(Group H)and the low concentrion(0.125%ropivacaine) group(Group L).All patients received general anesthesia with tracheal intubation.After operation,all patients received continuous femoral nerve block for postoperative rehabilitation pain.visual analog scores(VAS) during rest,initiative exercise and continuous passive movement(CPM),time of first walk,muscle strength grades and complications were recorded.Results:The VAS during rest,initiative exercise and CPM at all time points in Group H were significantly lower than those in Group L.There was no significant difference about the time of first walk between the two groups[(27±4)h vs.(25±2)h].Average muscle strength grades during postoperative 24-72 h in two groups were above grade 3.Conclusions:Compare with 0.125%ropivacaine,0.25% ropivacaine can provide satisfactory postoperative rehabilitation pain.