Well, good luck to you. I was recently in your position. I started at SGUSOM and didn't know a thing about ortho. A lot of profs/doctors told me that I would become an orthopedic surgeon based on my build, so I decided to give it a look at. I went to the hospital in GND, shadowed and orthopod there, and fell in love with the field. Realizing that I was from the Carib, I decided that I wouldn't secure an ortho residency, and gave up on the dream. During my MS3 year, I did a 1 month rotation in ortho, and knew that I had to be an orthopod, no matter what. During my MS4 year, I applied for transfer, and was accepted to a stateside allopathic school as an MS3. Yes, I will have to repeat MS3, but ortho is significantly easier from a stateside school.
Had I not been accepted, I would still have applied for an ortho residency. My stats were good (247/99, 3.82 GPA, honors in all rotations), but I knew that I would be fighting for a seat with more impressive candidates from carib schools. I decided that I would apply for ortho, and if I didn't match, I would scramble into a prelim GS. I would reapply for the match and look for pgy-2 openings somewhere.
It is possible to match from a caribbean school...people tend to make ortho seem inconceivably difficult, but after speaking with 3 carib ortho residents, it isn't impossible. It might be harder, but it isn't impossible. An SGU grad recently matched into ortho (univ program) with ~220 on step 1, and was called by another program bc they were upset they didn't get him. He was very friendly, fun, hard working, etc. Made some great contacts, and had people fight for him. Another SGU grad I personally spoke to got into a university program with ~235 step 1, top 10 in a class of ~300, etc. He told me not to listen to the people that say 'ya won't make it'...if he did listen to them, he wouldn't have been where he is now.
Point: don't listen to many of the elitists on this forum that will tell you that you have no shot. If you want it bad enough, you can get it.
Good luck!