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Writer's pictureDr. Wenny Wang Bauman

X-ray Positioning in OFA Hip Dysplasia Grading: The Devil is in the Details

by Lonnie L. Davis, DVM with Nancy P. Melone, Ph.D


Hip dysplasia, a debilitating orthopedic disease, affects many breeds, particularly large and giant breeds. Consequently, hip grading and hip certification of purebred dogs has become increasingly important to breeders, pet owners, and veterinarians alike in efforts to reduce the disease. A correct diagnosis of hip dysplasia is essential when a breeder evaluates breeding stock, a veterinarian advises dog owners, or a pet owner considers treatments and therapies for the family dog. This article discusses the detrimental impact that an incorrectly positioned X-ray can have on the accurate diagnosis of hip dysplasia or hip grading and certification. The case is explored empirically in a study of 200 dogs initially submitted to OFA for hip grading and then resubmitted to OFA after follow-up X-rays were taken using the Precise Positioning Technique® developed by the first author. These data show the importance of correct positioning in capturing the true anatomical structure of the dog on the X-ray for the purpose of accurately identifying canine hip dysplasia.



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