Thank goodness, you rarely see polio braces anymore, since it's been nearly wiped out in the United States, and in most of the developed world.
I know Sister Elizabeth Kenny from Australia pioneered many of the techniques used in modern physical therapy and she did not necessarily advocate using braces for polio patients, unless absolutely necessary.
Of course, very few people outside the White House ever saw President Franklin Roosevelt's leg braces, either. They were mostly hidden by his trouser legs. People knew he had suffered from polio, but few knew how limited his mobility was, and care was taken to keep it that way.