In this article on hip dysplasia in cats, I refer to a research study entitled, “Hip Dysplasia: A Feline Populations Study by GG Keller DVM MS et al, dated 1999 and published by Wiley InterScience. Short quotes that are permitted under license are from this paper.
“There were 684 cats from 12 breeds. The data derived from this study indicate the frequency of feline hip dysplasia in this population to be about 6.6% (45/684) and that the incidence appears to be breed dependent.”
Hip dysplasia is the abnormal development of the hipbone and the femur (coxofemoral joint).
Hip dysplasia affects many species including the human. It is the most “commonly diagnosed orthopedic disease in dogs.”
Hip dysplasia is inherited. The mode of inheritance is polygenic. The environment under which the cat lives can exacerbate the illness.
Cats “seldom have clinical signs referable to hip lameness”. The lack of obvious symptoms may have allowed breeders, who selectively breed for appearance, to include cats predisposed to hip dysplasia in their breeding programmes.
The Maine Coon cat, probably the world’s most popular purebred cat is known to suffer more than most breeds with this defect. The Orthopedic Foundation for Animals Inc. hip registry has records in relation to the Maine Coon that indicate that over the period Jan 1st 1974 to Dec 31st 1995 there were 288 requests for evaluation of “coxofemoral joint conformation in cats”. Of these 284 related to the Maine Coon (123 males and 161 females). 21.1% had “radiographic evidence” of hip dysplasia.
As to the study in question, x-rays of cats taken over the period Jan 1st 1991 to 31st December 1995 at the University of Missouri, Columbia College of Veterinary Medicine were screened.
696 cats were evaluated. 12 breeds were represented. This is well short, incidentally, of the 40 odd breeds recognised by the CFA. There are over 100 cat breeds in all. This is a limited survey but useful nonetheless.
The findings are as follows:
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