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"Results suggested that OFA scoring of HE radiographs underestimated susceptibility to osteoarthritis in dogs, which may impede progress in reducing or eliminating hip dysplasia through breeding," the study says. The study found that the PennHIP method was a more accurate indicator of dogs’ susceptibility to osteoarthritis. The study was conducted by researchers from the University of Pennsylvania’s School of Veterinary Medicine, one of whom, Gail Smith, VMD, PhD, invented the PennHIP method.
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This method generally defines a DI of ≥0.30 as "osteoarthritis-susceptible," and a DI of ≤0.30 as "osteoarthritis-non-susceptible."Įarliest age of evaluation (for certified results)Ĭalculated Distraction Index 0-1 (0 is the best) evaluated by trained veterinarianħ-point system from excellent to severe, based on evaluation of three independent radiologistsĪ recent study compared the relationship between the OFA hip joint scores and the PennHIP distraction index values. The index is measured using circular gauges that are placed over the films, and the final number reflects factors such as the size of the dog and how it compares to the rest of the population. The test is not pass-fail, and the score is actually based on a measurement of the hip’s distraction index (DI).Īccording to the organization, "the DI is an indication of the ‘percent out of joint’ that the femoral head is displaced from the acetabulum." So a DI of 0.15 means the femoral head is 15 percent out of joint (a tight hip), and a DI of 0.77 means the head is 77 percent out of joint (a pretty loose hip). A score between 0-1 is assigned, with 0 being very tight hips and 1 being very loose. Three radiographs are taken to measure the hip joint laxity. Unlike the OFA test, PennHIP requires the dog to be anesthetized. The test relies on interpretation of a radiograph of the dogs hips, which are then assigned a score by three independent radiologists: Excellent, Good, Fair, Borderline, Mild, Moderate and Severe ( Click here to read an explanation of each score).Īnother, more recently developed test, is the University of Pennsylvania Hip Improvement Program (PennHIP) test. This system rates a dogs hip joint on a seven-point scoring system.
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A recent study attempted to look at the differences in the two most common tests.Ĭurrently the test regarded as the "gold standard" used to determine a dogs susceptibility to hip dysplasia is the Orthopedic Foundation for Animals (OFA) hip joint scoring system. One way to achieving this goal is to have an accurate test for susceptibility to this disease. Responsible breeders are always trying to reduce the risk of hip dysplasia in their dogs blood lines.