Minor tear a few years ago. Arthroscopic repair. Takes an MRI to diagnose. My primary care physician didn't think it was torn since I'd been biking and went on a 10-day backpack with it. He was wrong. It hurt like the devil.

I was spinning easy 4 days after surgery, back on the bike riding normal routes in 2 weeks, but it was really a year before I was back like I was. The worst of it was the damage to the surrounding tissues when they inflated and tourniqueted my knee for the arthroscope. Knee is perfect now.