I guess I was more so concerned as to whether fellowship training after 5 yrs of GSurg residency caused u to lose a little of what you previously learned; but u guys cleared that up for me. Thanks alot!
Agree with WS. The need in the developing world for ANY medical help means that your skills will be in demand in most any specialty. It can be GS, NS, ortho, IM, peds, Ob/Gyn, ophtho, ENT, uro (radiology, rad onc, derm, anesthesia, neuro and path less so).
You (personally) don't have to do it all. You'll have more than enough on your plate as a GS (w/o fellowship) at a missions hospital. There aren't that many of them - most missionary docs I've met/seen are FM, peds, Ob/Gyn (no IM's or IM subspecialists, to be honest). GS will make you a prized commodity at any mission hospital.
If you're on the mission field one day and observe that a particular pediatric or orthopedic or what have you condition is repeatedly coming in, you can try to get in touch with an ortho or peds surgeon in the US interested in part time missions. They can fly out for a few weeks teach you how to deal with that condition. Think about this pathway, too. You can be a specialized physician/surgeon in the US who goes around the world and teaches physicians/surgeons in foreign countries new/better procedures and techniques.
One other point: don't do missions GS (or medicine, really), if the witnessing aspect is important to you personally. No doubt you will be a focus and a recruiter of patients to the hospital who may be witnessed to, but you will have little time for it, and won't generally have the sort of expertise in language and cultural nuance to be the best missionary. If your goal is to actively and personally witness, the medical (or at least surgical) route is probably not best.