I've been riding fixed for at least a year now, and I love it. I've found that I'm good at skidding and skipping, so lots of times I try to ride without touching the brake just to hone my skills. Now it looks like the chickens have come to roost: I've got some aches in my left knee.
I'll still be riding fixed, but it looks like I'll be taking it easy, doing knee exercises, and driving to some places I might have otherwise biked (like work this morning). I'm even thinking about taking off my clips so I can't skid and putting on flat bars so my hand is always by the brake. It makes me sad.
Of course, it doesn't help that the floor at my place of work isn't padded, and I'm supposed to wear dress shoes.
Hopefully my knee will get better soon, but by that time I think I'll be in the mountains - Appomattox, VA. I'm doing a pottery residency there for a year, and hopefully I'll be able to keep up the riding.
Just a friendly reminder to save your knees. Brakeless ain't cool if it breaks you.