There was no injury or change in activity I can link to it, I was and am in good shape (obviously better before), have never been overweight, eat healthy, exercise
almost daily (before the injury- bike
, swim, hike, rock climb), don’t smoke, am not stressed out, etc. I just noticed my right knee felt odd one day and figured I tweaked it somehow and it would go away. It just got worse though, and my left knee followed it a month or so later.