Ortho Chair Letter?

Hey all,

Is there a list floating around on the web with regards to which programs require Ortho Chair letters? I'm currently in a position in August for my sub-I where there will be too many fourth year students (12) rotating in the Ortho Department. I'm a little concerned about the low percentage chance that i'll be able to work with the chairman. That being said, I know some programs require chair letters. I know I can just schedule (presumably) a meeting with him to attempt to ask him to write a letter, but obviously it wouldn't be a personable letter and I feel it would hurt my chances at matching next year than helping.

Any advice would be great!