The purpose of this study is to compare two accepted methods of pain control in knee arthroplasty surgery.The first method combines the periarticular injection of ropivacaine with continuous blockade of the femoral nerve.The second method uses periarticular infiltration of ropivacaine in combination with an bolus of ropivacaine into an intraarticular catheter placed intraoperatively followed by a continuous intraarticular infusion of ropivacaine. All patient will also receive a sustained-release oral opioid and oral rescue opioids determined by pain severity using the Visual Analog Scale (VAS)
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Enrollment
123
Initial bolus of ropivacaine 5mg/ml 30mls into the femoral-nerve-catheter preoperatively. Periarticular infiltration of ropivacaine 2mg/ml 150 mls intraoperatively. Continuous perineural infusion of ropivacaine 2mg/ml at a rate of 6 mls/hr postoperatively. Rate can be adjusted to achieve optimal pain control and avoid motor blockade.
Periarticular infiltration of 150 mls ropivacaine 2mg/ml intraoperatively, intraarticular injection of 40 mls ropivacaine 2 mg/ml at skin closure followed by infusion of ropivacaine 2 mg/ml at a rate of 4 mls/hr delivered by an intraarticular catheter until the morning of postoperative day 3.
LKH Feldbach
Feldbach, Austria
RECRUITINGStatic and dynamic pain scores (VAS)
Time frame: 72 h
Maximum knee flexion (active/passive)>= 90°
Time frame: 72 h
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