Sooz, I have the same question because I enjoy a really good soak now and then, however, I can't really see that happening yet. Hmmm...no, not at all, especially with another knee that needs replacement; pffft! Maybe by ...I dunno,... 6 months post-op? A year? I'm sure it's very individual. I'll have to ask my PT and see what he has to say about it. They don't have a *practice tub* there, but he might be able to show me a safe way to enter and exit.
I *think* I could get in and out of a hot tub/spa, but right now, I'm not wild about the idea of a public one. Color me *germaphobe*, lol.