We have used 0.125% Bupivicaine in all of our catheters for over ten years. That would be over 10,000 catheters.
We have had tremendous success with this concentration. Some interscalene catheters we end up running at 2ml/hr.
We have always used bupivacaine because of the cost differential. I think 0.25% bupivacaine will give you much more
motor block than you will desire. I really have no experience with Ropi in catheters. Some use 0.1% and others use 0.2%.
For our initial block we use 0.25% bupivacaine on upper extremities, 0.5% ropivicaine on lower extremities except adductor
canal/femoral triangle blocks where we often use 0.2% ropivicaine. That way we have a solid initial block before the pump is
started. We don't start the infusion until later in the day after surgery.