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"Hip dysplasia is a fairly uncommon disorder in cats that involves abnormal development and subsequent degeneration of the coxofemoral (hip) joint.  It is thought that the immature hip joints of affected cats have a genetic predisposition to subluxate (partially dislocate), causing abnormal forces across the hips, irregularly shaped bones, damaged cartilage, microfractures and, in severe cases, osteoarthritis.  It is important for cat owners to recognize the clinical signs of hip dysplasia so that effective treatment options can be pursued as early in the course of the disease as possible.  This can be difficult, however, because the signs of hip dysplasia often mimic those of other degenerative disorders."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Cats/Health/Hip-Dysplasia/Symptoms.aspx>