A randomized controlled trial comparing continuous femoral nerve block and local infiltration analgesiafor total knee arthroplasty

INTERVENTION: A continuous femoral nerve block for pain after total knee arthroplasty (total of 20 ml of 2.0 mg / ml of ropivacaine was injected around the femoral nerve as an initial block. Postoperatively, 1.5 mg / mL of ropivacaine was continuously infused at the rate of 5 mL per hour for 48 hours through the catheter). A local infiltration analgesia for pain after total knee arthroplasty (7.5 mg / ml of ropivacaine [40 mL], 100mg of ketoprofen [5 mL ], 1 mg / ml of epinephrine [0.5 mL] and 40 ml of normal saline). CONDITION: Osteoarthritis of knee PRIMARY OUTCOME: Visual analog scale score at rest at 1 day after surgery. SECONDARY OUTCOME: The postoperative visual analog scale score at rest other than at the 1 day.; Total amount of morphine consumption.; Post operative labo date.; Post operative complication. INCLUSION CRITERIA: Patients scheduled for primary unilateral total knee arthroplasty.