There are plenty of people in your position unfortunately. They are sharing their experiences in another forum.

http://www.orthogate.org/forums/orthopedic-surgery-residency-forum/6459-applied-to-orthopedic-surgery-and-0-interviews?start=6#33362

As some others have said, there will be a kind of dual peak in interviews. One where you are the first pick of the programs the second being where people decline interviews and they come back up for grabs. Hopefully you will get more. Try not to stress, but I'm in a similar situation, so I feel for you. Good luck!