Not from cycling at all! I was playing volleyball, spiked the ball and hyperextended my knee when I came down. Rubberband *SNAP*. Went without an ACL for like 4 years till I couldn't stand the pain anymore, so got the patellar tendon cut in half for my new ACL. My other knee, volleyball related as well...dr scoped it and said that it looked very odd, he shouldn't be able to see the bone from the angle he was looking at. My ACL had ripped from the bone, then reattached itself lower down on the bone. Oops. He said I would eventually want to get it put in the correct place. Yeah, like when hell freezes over...Smiley,
Why do you need so much knee work? I'm hopin it isn't due to cycling.
When I tore my knee (stepped from a ladder onto a wet counter top while removing wallpaper from my bathroom) my doctor suggested I tell people that I did it mountain biking.I have chrondomalacia in both knees, been scoped in both for meniscal tears and have a torn PCL in one (all from other sports) - I only get knee pain if I select too large a gear or chainring or if I stop spinning and "mash" the pedals.