i had IVRO, 2-piece Lefort I, and genio one year ago. (I relapsed and need more surgery, but that's another story)
I have significant numbness in my lower lip, as in still can't drink out of a cup without making a mess, and it does drive me crazy. Like Pekay pointed out, I have full mobility, I just can't feel anything.
My surgeon has said over and over that no nerves were severed/damaged in the surgery, so I should not have any numbness. But I do. I think it must be from the genio and not the IVRO, but I do also have some numbness were the bony cuts were made. My chin is also numb, and there are a few painful sensitive areas. I am wondering if the nerve is somehow pinched in there.
Now, I am a woodwind player as well, so lower lip numbness is very significant to me. I'm not sure how "crazy" it would drive anyone else. I am guessing at this point that I will not get anything more back. My other areas of numbness are pretty much gone.