Comparing Femoral Nerve Catheters to Single Shot Femoral Nerve Blocks for Total Knee Replacement Surgery

"Catheter will be bolused with 0.5 % ropivacaine around the femoral nerve and occlusive dressing applied over the catheter.~Patients with CFNB will receive ropivacaine 0.2% infusion (the infusion rate will be dependent on the clinical judgement of the anaesthesiologist)"

The group with SSFNB will receive a femoral nerve block before the surgery in the pre-operative area guided by a nerve stimulator and ultrasound. A bolus of 0.5 % ropivacaine will be injected around the femoral nerve.