i had a side bud stem bend sharply over, i mean way over, was like that probably for 2 days or so
the bud had started to yellow, and it didn't look good for that bud
but what the hell, straightened it up and tied some string to keep it up
4 days later and you wouldn't know there was a problem, just a bulge where the stem has fixed itself
moral of the story, if it's not outright cut, you probably can save it