The IKC have asked to be informed (if the dog is registered) so as to avoid breeding from / with dogs with these symptoms. The breed has been brought close to ruin (big healthy, friendly, intelligent dogs at their best) by some unscrupulous breeders in recent generations.
This precise topic featured on a radio programme in the last few months, but I cannot remember which one. For some unknown reason I think it was Mooney Goes Wild (RTE1) but I rarely hear that show and german shepherds aren't wild. I remember there wa an IKC rep, a vet and a breeder from either Germany or Austria interviewed.