I had the same thing happen to me . i was riding in a creek and a towel somehow got twiststed around my axel on the left rear and turned the boot all cocked eyed. I just cliped the clamp off (the big one) on the side that was twisted the worst and got a new clamp from the dealership;once I had the clamp I went to the auto parts store and purchased a tool for the clamp install, I put some more greese in it put the clamp on, used the tool to get it on nice and snug and that was it. If it is not torn you do not need to replace it.
Good luck!