Splints post-op are basically just a billing thing where they can use hospital materials to get a decent CPT ( and the ortho or some pods have PAs/resident/fellow to apply them, change them, replace, switch to cast in office, whatever). The splints - or casts - are not very logical or fast or easy when you work by yourself... and for office, the pre-cut orthoglass for splint costs same/more than you get for a splint from many insurance payers (esp when you consider your time). Cast materials + time vs its reimburse is not a ton better... but again, if ASC/hospital materials and "helpers," then many will try for dat $$$.
Their better splint application is in ER (acute ankle, calc, etc fx) where significant edema is expected and pt is sitting and splint/cast dries without any posterior/heel pressure.
If you are set on using splints in OR, do plenty of padding w good cotton Webril, let it dry fully, tell PACU to put pillow up by calf, not under heel. It's generally just not smart as they crack, rub, waste time, etc. It's basically a residents/teachinig thing for more rVU. Foot/ankle surgery (properly performed/educated/pt selection) just doesn't swell THAT much, and cast/boot is much better protection against early WB or a stumble.
...Personally, I just use CAM boots (why would you do elective sx on pts you don't trust?) and occasional bi-valve cast (for major trauma or recons where it'd be detrimental to walk on early and/or I don't know the pt well as they're fresh from ER with major injury). Most of the time, I want to put a basic bandage on, soft Jones, and CAM boot... on to the next case.