I'll do a little research and see what I can find. It certainly wasn't Garry Moore; he had no orthopedic problems. My best guess is that it was probably Bill Cullen, who clearly did have mobility problems, which he didn't particularly try to hide on the air (although some accommodation was always made). He hosted many Goodson-Todman quizzers like the original Price Is Right and a boatload of others.
Let me see what I can find out.