Ein interessanter Artikel zum Thema auf der Workingdog Seite:
Comparing PennHIP and OFA
Und hier noch ein sehr interessanter Text aus einem englischen Forum, die haben es wieder aus einem amerikanischen Forum.
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Here the post....
here's some facts
hip dysplasia is abnormal hip conformation , djd is abnormal , laxitity is abnormal , shallow acetabulum is abnormal . simple as that .
djd (developemental joint disease) is just what it says "developemental" an ofa mildly dysplastic dog will not have djd at 2yrs + of age , will either have excessive laxitity or shallow acetabulum . young dogs , even dysplastic dogs do not have djd unless they are severely dysplastic .
ofa will tell you on an adult dog 2+yrs of age whether or not the dog is dysplastic or not at that given time . i believe they look for 2/3rds parallel , 50% coverage by the acetabulum , and signs of djd . well parallel is easy enough to see , amount of coverage is also easy to see , djd can be easily seen if it's there , it's a picture , it takes like a second , it's not rocket science to spot a dysplastic/abnormal hip . the problem is to grade it accurately , there is a fine line between excellent and a very good hip , there is a fine line between a marginally fair hip and a barely mildly dysplastic hip . the other problem with many breeds is low end hip conformation is the norm , so given a choice a lot of breeders don't like ofa , because of the stigma with breeding "dysplastic" dogs . they need to be breeding marginal dogs , some of the better dogs may not even be marginal , they are clearly dysplastic . well with the "hip hype" that doesn't fly . so what would you do ?
pennhip , can be done on a 4-5 month old dog ( mildly dysplastic dogs may go a lifetime without developing djd ) the DI's are breed specific , they're not comparing the hip to normal hips , they're comparing the hip to hips normal for the breed .
pennhip is going to check for passive hip laxitity , they theorize that passive hip laxitity correlates with developing djd . they say if your dog is less than .3 they will most likely never develope djd .they say if it's .3-.5 it's in a "gray area " they say the higher the DI the greater the chances of the dog developing DJD . they theorize that the DI's are breed specific , a ddb can be .7 , a bullmastiff can be like .5 , i believe an AB can be somewhere around .5-.6 . you may check my numbers i'm sure thety are close .
pennhip will predict the chances of whether or not your dog will become dysplastic . looking for djd on a young dog is not really something that means much . they do not call your dog dysplastic , they say it is over or under the median and rank it with other dogs of it's breed . they suggest breeding animals under the median , a ddb with a .69 is under the median , but this is over the median for american bulldogs , which are over the median for bullmastiffs , so pennhip is much more breeder friendly . they do however use an ofa hip extended view to look for djd , if your dog has it they will tell you that , again unless it's an old dog , or a severely dysplastic dog they're not going to have djd , regardless of whether they are dysplastic or not .
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