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I think this is the article Dobiegirl is referring to.
http://idw-online.de/pages/de/news586117
If it is a gene, it is quite likely that every GSD carries it, HD is known to skip generations . It is an interesting article though.
As Alec says , responsible breeders and owners have been x raying since the 70s (and indeed before) and it is disappointing that the improvement has only been slight, although I do think there has been an improvement certainly in GSDs. The problem is that people x ray and then still breed from animals with poor hips, there is nothing to stop them doing this, even if they are members of the KC Assured Breeders Scheme. They have to health test to be members of the latter but don't have to abide by any criteria for result/score. As people posting on AAD have shown, the general puppy buying public are often still not aware of the need to buy stock from low scoring parents, and as long as the irresponsible breeders have a market they will keep churning them out.
Agree with this as well MM - it has little to do with the KC, it is the breeders who continue to breed from dogs with genetic problems who are the ones to blame. I even know of show quality CKCS who were still used at stud despite being tested to be predisposed to syringomyelia, just as certain breeders still bred from dogs who were predisposed to heart/eye problems. These are the people who give pedigree dog breeders a bad name, not the Kennel Club.