Avery has this.. we actually need to go in for a checkup soon!
We currently have her on Gycoflex for it!! You should do a search on here, take her to your vet, and get some more help on what to put your baby on for this(gycoflex, cosequin, etc.) You will find alot of info online.. there are quite a few people who's yorkies have this.. many have had surgery!! Everyone posted lots of great info on this thread!!
you should also look into getting some pet stairs, etc. so your baby doesn't jump!
good luck!!