What grade is the patella? Most reputable breeders breed as close to standard as possible. Trying their best to minimize certain breed problems. Patella problems are a problem for poms. This will be a problem if you were trying to purchase a dog suitable for breeding later. Are you planning to show?
I see it's been a while since your post, did you decide to purchase that pup? Good luck with your lil fur baby if you did. They all need lover.

Jewel
boxer owner