There are 4-6 programs in the country that offer combined (5 year) programs in peds/PM&R. Aside from U. of Cinncinnati and U. of Colorado, Temple and Thomas Jefferson also have combined programs.
Peds rehab can be depressing... but it can also be as inspiring and uplifting as, well, any branch of medicine. I spent some time at the Children's Seashore House (part of CHOP, but Temple and Jeff residents rotate through there also), and I loved it. It's interesting stuff, you can really make a difference in quality of life, and there's a huge need for it right now. I mentioned my interest in pediatric rehab in my personal statement, and all of the programs jumped on it... everyone I interviewed with was very enthusiastic about the field and made sure to emphasize how much they need qualified people.
I interviewed for the combined programs at Temple and Thomas Jefferson... here are a few quick thoughts.
Temple:
Great program, with a lot of great attendings. My only problem was with the pediatric side, which is done through Albert Einstein Medical Center (Philly, not NYC). I really wasn't crazy about Einstein. They recently closed their inpatient pediatric floor, so they're sending their residents over to St. Chris for all of those rotations, along with a good part of their subspeciality rotations. This didn't bother me that much at first, but as time went by and I interviewed at other programs, it started to really nag at me. Granted, St. Chris is a great hospital... but a recent graduate told me that the Einstein residents were treated like second class citizens over there. Also, there were a lot of rumors going around on the pediatric interview trail about Einstein... no one thought that they were even interviewing this year.
Thomas Jefferson:
Nice program, and I loved the residents, but I wasn't blown away by them. duPont, however, is fantastic for pediatrics... it's a great children's hospital, and I really loved everyone there.
If I could have combined Temple and duPont, I'd have done backflips for joy... but in the end, I didn't like Einstein or Jeff enough to rank either of them, and I ended up just ranking pediatric programs. (I spent my whole peds rehab rotation whining about how I wanted to do a pediatric residency first and a rehab fellowship after that, if such things existed... and I eventually listened to what I was saying.) If I have to go back and do another residency, I will... or I may just go into neuro or development, as there's lots of need, and lots of overlap. We'll see.
Anyway... if you want to do a rotation, I can't recommend CHOP enough. It's a great hospital, and I can't say enough good things about the attendings. (Except that they forgot to circle my grade on my evaluation form, and I'm having trouble getting in touch with them... but, other than that, no complaints.) Also consider peds rehab fellowships (I know that Kessler has a very nice one), but make sure you get a good grounding in pediatrics at some point... it'll make call much easier.
Oh, yeah- one more thing. Starting this year, they're changing the requirements... in order to sit for the Pediatric Rehab boards, you'll have to do an extra fellowship/research year after a 5 year combined program or a two year fellowship after a 4 year PM&R program. Up through this year, you could just sit for the boards right out of the combined program. In the end, you won't save any time with the combined program... but you'll be much more comfortable with pediatric issues.
Good luck!