03 Canine Hip Dysplasia: How Was PennHIP developed?
Description
This article is from the Canine Hip Dysplasia FAQ, by rpd-info@zmall.com (Cindy Tittle Moore) with numerous contributions by others.
03 Canine Hip Dysplasia: How Was PennHIP developed?
The development of PennHIP has involved multiple disciplines including
biomechanics, orthopedics, clinical medicine, radiology, epidemiology
and population genetics. The first phase of development involved
sophisticated biomechanical testing to determine the optimal patient
position for measuring hip laxity. By monitoring passive hip laxity in
dogs as they matured, it was discovered that hip laxity was the
primary factor in the development of the DJD characteristic of CHD.
That is, the radiographic expression of DJD was statistically
significantly correlated with the degree of measured passive hip
laxity. In addition, the CHD prediction was shown to be acceptably
accurate in populations of puppies as young as sixteen weeks of age.
Moreover, the correlation between passive hip laxity and subsequent
hip DJD was shown to increase over the four-month figures when hips
were evaluated at six months and twelve months of age. In the same
studies, it was shown that there was no statistically significant
correlation between laxity and DJD when the standard hip extended
position was used. In addition, no other method used to evaluate for
CHD has undergone similar rigorous testing through controlled
scientific studies to determine diagnostic accuracy.
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