There is a vet in PA would figured out how to fix these even when they
are beyond what a cast can help heal, working on a ferret (of some real
sweeties) who had congenital problems with both elbows so they failed
under normal stresses.  No one else could get them back in.
 
The vet is Judith Rutkowski, Allentown Animal Clinic (610) 434-4470
 
so your vet could call her for long distance consultation
 
She used hypodermic needles, plastic caps and wires to construct pins.
For that ferret the pinning construct did not even need to be in forever.
 
-- Sukie (not a vet, and not speaking for any of the below in my
private posts)
Recommended health resources to help ferrets and the people who love
them:
Ferret Health List
http://www.smartgroups.com/groups/ferrethealth
FHL Archives
http://ferrethealth.org/archive/
AFIP Ferret Pathology
http://www.afip.org/ferrets/index.html
Miamiferrets
http://www.miamiferret.org/fhc/
International Ferret Congress Critical References
http://www.ferretcongress.org
[Posted in FML issue 5240]