Is it just me or is there more GSD's lately with this condition?

my sister lost a dog from this roughly10 yrs ago- it rarelys strikes at less than 10 yrs of age so the dog was born 20 yr ago. Since the dog breeding career would be well over by 10 (and probably daughters wold be past bearing age as well) it's been difficult to breed out. A test for it JUST came out so reputability bred lines should see a decrease - starting in 10 years.....a href="http://www.caninegeneticdiseases.net/DM/ancmntDM.htm" rel="nofollow"http://www.caninegeneticdiseases.net/DM/…/a