Mostly, I've had issues with scar tissue - this is an operation where you want scar tissue forming in the right places, but not the wrong ones, so I've had a couple of minor ops which seems to have fixed it - mostly now it feels tight (they put it in too tight on purpose, a bunch of physio is stretching it to the right length, starts with an adjustable moon boot, a bit of a medieval torture device that slowly stretches it) - if you stretch too far they can't undo it without opening it up

I can hike reasonable distances (multiple kilometres), running not so much a thing - I feel incredibly lucky I'm doing as well as I am

I'm very aware that if I break it again I'm probably screwed (and all I originally did was step in a hole, nothing strenuous) so I'm generally careful