Ahh yes sorry, the patella is basically the knee joint on a dogs back leg, in smaller breeds they can have a lot of trouble with them slipping and causing pain/discomfort when they move.
I didn't know it was latin though, thanks WonderGirl :D
Seeing as how the vet put him on glucosamine I would be leaning towards and arthritis problem.
It wouldn't hurt to get him checked out by a vet again, my mother in law gives her dog mussell extract for her yorkies arthritis and it was almost like a miracle cure. The dog went from moping around and could hardly walk to bouncing and playing again in a few weeks.
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