Well as an FMG... I will go over of a pretty obvious facts:
is really hard to get in an ortho program even if you are an american graduate. Usually the americans graduate get 5 to 10 interviews... as a FMG you will probably get 1 or maybe 2 if your are a super star!!! and usually those interviews are in places where they know you (because you are/were a research fellow, or you rotate for months in there).
The ortho programs usually discard the FMG applications without even look at them, and I believe that is "Hostile" in the first place (I don?t mean it in the wrong way, what I try to say that is not really fear), but that is just my opinion. They say that there is no way to compare the grades from a Foreign school with an american one...
Then you have a second handicap, the visa thing, usually the programs do not want to deal with all the paper work that involve getting the visa, either the J-1 or the H-1B.
Even for the american graduates, to be able to get a spot in ortho, you need to be a ?good candidate", and everybody known that means good scores PLUS good contacts.
In conclusion, a FMG, in an already difficult path, have a harder way to go.
GOOD LUCK TO EVERY ONE!!!