This is a topic that usually comes up yearly. If you haven't already, please use the search function and use fmg and img in the keyword section.
Here are some numbers for 2003. I don't have 2004 yet. They will be out in September.
152 Programs
3024 Orthopedic Residents
2942 (97.3%) USMDs
285 (9.4%) Women
62 (2.1%) IMGs
2 (0.1%) Canadians
18 (0.6%) DOs