We do femoral catheters for all of our total knees, and only one of our orthopods wants us to do single shot sciatics. When I say that, I mean that he knows that we do them for patient comfort but doesn't particularly ask for them. However, he really doesn't want any foot drop at all from the sciatics, so I'm only using 30 mL of 0.2% ropivacaine for the sciatic. This doesn't last very long and so maybe isn't worth doing but the patients are very happy until the block wears off.
As far as what PT wants, it doesn't really play into the situation. We go along with what the surgeon requests and then PT just deals with it.
I personally think adding the sciatic makes it much nicer for the patients, but the orthopods are very wary of sciatic nerve injury and are just plain uncomfortable until any foot drop or even just decreased sensation/numbness from a block is completely resolved.