Originally Posted by
Campag4life
http://www.cptips.com/knee.htm
Lastly, until you resolve this, change how you ride the bike. Spin a light gear. Focus cadence in the 90-100 RPM range.
Other influences are seat position...height is key and also fore/aft position. Knee pain or health aside from what God gave you to work with is largely influenced by your mechanics and riding ability. People ruin knees all the time with poor technique.
Good luck.
Unless you're like me, and have a repetitive stress injury. In which case the more revolutions you have the worse off you are. I wish it were always as easy as more float or different pedals or higher cadence but I don't think the advice applies in all situations.