Hi tehbe,
It would be very hard to tell a dislocated leg from a broken one, I'm sorry to say.
A break right near a joint is almost impossible to splint. However whether it's a break or a dislocation, if it's at the hip, it's going to be very hard to fix. I doubt a dislocated hip will ever be normal no matter what you do with it. (If it's the hock joint, you may be able to splint it so the leg fuses; the bird won't be comfortable but may get by.)
My feeling is this would be a vet case, or a cull. Sorry to say that (and by all means ask others for ideas). 
Best of luck with it,
Erica