Hi and welcome. We have all sorts of recovery here, some fast, some very slow, so your situation can be quite normal.
Four months doesn't seem too bad, particularly as you had an MUA. Of course it set you back, abusing your poor knee like that. It's a great shame you didn't join us before that decision was made.
I think we need a bit of info, like what bend were you getting when the decision for an MUA was taken, and what is it now?
Have you had a browse around in the library section, that's a mine of brilliant info about recovery. I'd post the links here, but alas I've never worked out how to do that, but there are several cleverer people who will be popping in and doing just that.