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A young (> 1-year-old) spayed female domestic shorthair cat was referred for evaluation of lethargy and stertorous breathing of 3 days' duration. The cat's age was estimated on the basis of closure of vertebral body physes. The cat had been adopted and spayed at a local shelter 1 week prior to evaluation. On physical examination, the cat was thin, had bilateral nasal discharge, and had a rectal temperature of 40.2°C (104.4°F; reference range, 38.1° to 39.2°C [100.6° to 102.6°F]). The cat had a heart rate of 200 beats/min (reference range, 120 to 240 beats/min) with a regular cardiac rhythm;

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in Journal of the American Veterinary Medical Association

Abstract

Objective—To evaluate hip joint laxity in 10 breeds of dogs via 2 radiographic techniques.

Animals—500 clinically normal dogs.

Design—Prospective study.

Procedure—Radiographs obtained via routine hip joint evaluations performed in sedated dogs of 10 popular breeds were randomly selected from a database. Measurements of distraction index (DI) and hipextended index (HEI) on 1 hip joint radiograph randomly chosen from each dog were made.

Results—Mean age of dogs was 20.7 months. Mean HEI was 0.17 (range, 0.0 to 0.72) and mean DI was 0.44 (range, 0.07 to 0.96). Borzois had uniformly tight hip joints as judged by use of both methods and were considered the gold standard by which hip joint laxity was judged (all Borzois had DI ≤ 0.32). Overall, DI was significantly greater than HEI. Within each breed, mean DI was always greater than mean HEI. Significant differences were detected among breeds for HEI; however, compared with DI, the magnitude of differences among breeds was less.

Conclusions and Clinical Relevance—Distraction radiography detected the greatest range and magnitude of passive hip laxity in the 10 breeds of dogs. The difference in values between breeds known to have high prevalence of canine hip dysplasia and those in Borzois was greater for DI than for HEI. Breeds must be evaluated individually because of inherent differences in hip joint laxity. ( J Am Vet Med Assoc 2004; 224:542–546)

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in Journal of the American Veterinary Medical Association