I'll be controversial. . . . . . . .but truthful. I'm 6'3" and about 270 lbs. Former FB player, can bench over 300lbs. Have I had trouble performing some orthopaedic tasks. . . . .yes. But usually, if I couldn't do it. . . . . .no one else was going to be able to do it either. When I was a junior, if the hip couldn't get reduced by me in the ER, then we'd be booking it for the OR. No questions asked.
I have definitely seen some smaller residents struggle with things that come easily to me. Examples: Doing a Lachman's on a 350lb NFL lineman. Prepping a leg in a 350lb trauma patient with ipsilateral tibia and femur fractures. Hammering home a rasp down a supper tight femoral canal. Water skiing on a huge leg for hours (I could just lean my 270 lbs backwards w/o using much muscle activity) during a tough fracture case. This doesn't mean you should go out and start doing growth hormone. It just means you need to find ways to work with what you have.
In short. Is ortho a physically demanding field. Yes. 10x more so than ANY other medical field. But OVER 95% of what we do actually requires more brain and dexterity then braun. But the reality is I NEVER saw my size as a disadvantage. And if you're on the smaller size of the spectrum and actually believe that you have NO limitations, you're fooling yourself. It's like me thinking I'm gonna go out and win a marathon. Just my humble opinion.