On May 18, 2011, ex-MSNBC news personality Keith Olbermann appeared on The Late Show with David Letterman — his first television appearance since his exit from MSNBC on January 21, 2011.

Though the interview with Letterman is more about Olbermann’s upcoming return to TV via network Current TV, it’s the beginning that we’ll all find interesting: Keith Olbermann walks onto the stage with a cane — seems he got a stress fracture running in Vibram FiveFingers. Here’s the segment, as well as a transcript of the first two minutes of Olbermann’s exchange with David Letterman:

[Audience claps as Keith Olbermann enters the stage, walking with a cane]

KEITH OLBERMANN: Thank you! I can walk!

DAVID LETTERMAN: Good to have you on the program. Good to see you again. I had no idea that you were injured. Tell us about that and what’s going on.

OLBERMANN: Well, it’s not as easy to get out of NBC as it was when you did.

LETTERMAN: Oh I see. They had a guy work you over?

OLBERMANN: Ahh might very well think so I could not possibly comment. Ah no actually it was an accident in a shop class oddly enough.

LETTERMAN: Well they will happen.

OLBERMANN: I’m out of material. Uh stress fracture running.

LETTERMAN: How much do you run?

OLBERMANN: Not much at the moment.

LETTERMAN: No, not now. But are you like a 5 – 10 miles when you go out that kind of guy?

OLBERMANN: No 5 – 10 minutes on a good day.

LETTERMAN: How did you fracture your foot? I mean, I guess it’s obvious but why?

OLBERMANN: Badly. I fractured it very badly. You’ve seen the five-toed running shoes?

LETTERMAN: I have seen them: they’re like the glove.

OLBERMANN: Yes. My foot doctor is the doctor for the Rockettes, which is an enviable job that I’m” sure many of us men would like to have. What he said was these are the most wonderful shoes in the world to walk in. And I noticed this a year ago when I first put them on. They’re great for you knees. They’re great for your hips. They make you actually feel like you’re younger like can walk again. You’re not old guys. Unfortunately, if you try to run in them and you weigh more than 175 lbs., you will break something. This does not say this on the side of the box. And as he said, I hate to tell you this in your late stage of life here but you’re not less than 175 lbs. So walk to your hearts content but don’t run in them.

LETTERMAN: When did you first audition for the Rockettes?

So it seems Keith Olbermann may have run too much too fast in his toe shoes, he got a stress fracture, and his podiatrist (who I suppose we should be impressed with, as he works with the Rockettes?), drew a line in the sand that if you’re above 175 lbs., you can’t run in Vibrams.

What do you think about that? Are VFFs only good for running if you weigh less than 175 lbs.? Sound off below!