Total knee replacement under PNB

We are asked to follow joint commission standards for total joint replacements. It says PNB can also be used as primary anesthetic for TKR. I've never done one under just PNB. For you guys who do these under just PNB, what combination of blocks do you do? Anything to watch out for? Thanks!
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Anesthesiology Source Type: forums