I too have a bad knee. Mine is a result of HS football though. My right knee has 50% of the cartiledge (sp) that it should and the ligaments are a little sloppy. The result is a knee that kinda aches sometimes and is not cleared for extreme athletic duty, but being that I am only 24 I kind of ignore it and have fun anyway! Doc says before I am 30 I will have to have some repairs, oh well. Luckily it's my gas pedal knee and not my shifting knee
Kyle