Hi Jim I just had lower back surgery an I can tell you if that happened to me I would be on the phone immediately calling my surgeons office! That is not normal and it could be he has inflamation from the surgery and that could be causing the weakness in his legs but it could be allot of other things too, but his surgeon should be told about
it. It is really important, I do wish you luck in trying to convince him, but don't give up, maybe have his wife call the surgeon and have her tell him about
her husbands condition, one way or the other the surgeon should be told. If nothing else have your wife call the surgeon and have her ask the surgeon if this is normal all she would have to say is she is concerned about
her father. That would be one way of letting the surgeon know!
Good Luck on this
White Beard