I matched at Penn and 3 of 8 are female.
From the current makeup of residents at places on the interview trail i'd say these are female friendly:
Penn
NYU
Duke
UCSF
USC
Harbor-UCLA
UChicago
UVA
HSS
St.Lukes-Roosevelt (dont have any but are dying to get one felt like)
Please remember-Just because a program dosen't have any females dosen't mean they aren't a female friendly program.........once a program is scarred with not having a female in a few years they are automatically branded as being UN-female friendly which is NOT ALWAYS the case. Some have ranked females highly, but those females chose to go elsewhere (where there were females)............This is not to distract from the fact that there are several programs who aren't as receptive to having collegues with a uterus.....you just have to feel them out for yourself. If its not from the horses mouth (female who said they hated a program or was treated unfairly, female faculty who left becasue they personally said it was a hostile environment or male faculty/resident who personally stated they dont wanna work with chics) then take it for what it is......gossip.
Also don't write off a program because they don't have enough female faculty. Fact is women make up less than 4% of the field so you can't expect everyone of those women to go into academics.
Finally, dont write off a program because of that one old timer from the old school who just is stuck in their ways............there is bound to be an old dog at most programs. you will not LOVE every single attending and if you are going into ortho this is like football..........DONT PLAY THE SPORT IF YOU CANT TAKE A HIT.........ITS A CONTACT SPORT- YOU WILL GET HIT!
GOOD LUCK TO ALL.
If there are any ?s about the programs , being female on the trail or whatever pm me.