Continuous epidural infusion versus periarticular multimodal drug injection in bilateral simultaneous total knee arthroplasty: a randomized controlled trial

INTERVENTION: A continuous epidural infusion containing ropivacaine and morphine for pain after simultaneous bilateral total knee arthroplasty A periarticular multimodal drug injection including ropivacaine, morphine, bosmin, methylprednisolone, and ketoprofen for pain after simultaneous bilateral total knee arthroplasty CONDITION: Osteoarthritis of knee, rheumatoid arthritis PRIMARY OUTCOME: Visual analogue scale score for postoperative pain at rest. INCLUSION CRITERIA: Patients scheduled for simultaneous bilateral total knee arthroplasty.