About 3 years ago I just started trying to rollerblade. Well anyways I've been trying to go down this ramp for several days. Was never successful(read don't lean back). Well anyways I finally made it all the way to the bottom one time and the bottom part of my left leg went left while the top stayed. I ended tearing some ligaments and tendons and shit in my knee and I "think" I broke my butt bone. I had to keep my leg immobilized for almost 2 months after that.