I'm not gonna stop this hobby if it dose but with some of us doing hundreds and thousands of miles a year I can't help but think of the stress this puts on knees and ankles? I can just imagine that repetive spinning motion of the knee joint grinding away the cartalidge?

So dose cycling cause arthritis? Despite all health gains is this one of the downsides?

Or have I most likely got it all wrong?

I'm thinking along the lines of all these athletes that end up with this condition such as footballers ect.