Right now residencies in the DO world are in a bit of flux due to single accreditation. All of the DO residencies must become ACGME accredited by 2020. Unfortunately, I do not know about orthopedic trauma fellowships, but I do know a few DO classmates who really wanted orthopedic residencies but who didn't get picked up. There are fewer DO orthopedic spots as a whole, and this number may decrease with the new accreditation requirements. DOs can apply for MD spots, but its even more difficult as a DO. Either way, DO or MD, its a difficult road to become an orthopedic surgeon. If you want to do it more than anything else though, go for it! I'm not sure where you are in the schooling spectrum, but when you get to medical school (assuming you're a premed), keep an open mind. Even if you don't though, medical school has a way of making sure you pick the right specialty for you, and often it isn't the one you anticipated. I went in thinking I was going to be an orthopedic surgeon, and came out as an emergency med resident. Couldn't be happier.