Comparison of two radiographic techniques for evaluation of hip joint laxity in 10 breeds of dogs

Amy Kapatkin, Thomas P. Gregor, Kendra Hearon, Robert W. Richardson, Pamela J. McKelvie, Hilary H. Fordyce, Gail K. Smith

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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 hip-extended 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.

Original languageEnglish (US)
Pages (from-to)542-546
Number of pages5
JournalJournal of the American Veterinary Medical Association
Issue number4
StatePublished - Feb 15 2004
Externally publishedYes

ASJC Scopus subject areas

  • veterinary(all)


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