Those are brilliant, Carol, I could not find anything better!!!
It's very difficult to show this on an actual animal as it varies from animal to animal so much.
I count it as a very bad fault, but that is a personal view, I have met a number of people who do not give it a second thought.
Coming as I do from a riding / working background, I would not use an animal in my programme that was over at the knee. But I do think, from a "future of the breed" point of view, " f" is a far greater threat, and I have seen, over the last few years, in our strive for "finer boned" animals, a number of high placing animals with this fault.