+ another 1, for Speedplay Frogs.

I found out a couple of years ago--at the tender age of 53--that my kneecaps point ever so slightly outward, my left a little more than my right, and that was causing me to have pain in my left knee when riding with clipless pedals. I switched to Frogs, threw a Cho-Pat strap on the left knee, and I'm golden. The strap helps, but I couldn't use clipless pedals if it weren't for the generous float allowed by the Frog pedals.