Objective—To compare the accuracy of the extended-
hip radiographic (EHR) score, the distraction index
(DI), and the dorsolateral subluxation (DLS) score for
identifying hip dysplasia in dogs at 8 months of age.
Animals—129 Labrador Retrievers, Greyhounds, and
Labrador Retriever-Greyhound crossbreds.
Procedure—Radiography was performed when dogs
were 8 months of age. Dogs were euthanatized at 8
to 36 months of age; hip dysplasia was diagnosed at
the time of necropsy on the basis of results of a gross
examination of the articular cartilage of the hip joints
for signs of osteoarthritis.
Results—The EHR score, DI, and DLS score at 8
months of age were all significantly correlated with
degree of cartilage degeneration at necropsy.
Sensitivity and specificity of using EHR score at 8
months of age to diagnose hip dysplasia (scores > 3
were considered abnormal) were 38 and 96%, respectively;
sensitivity and specificity of using DI (values >
0.7 were considered abnormal) were 50 and 89%; and
sensitivity and specificity of using DLS score (scores ≤
55% were considered abnormal) were 83 and 84%.
Conclusions and Clinical Relevance—Results suggested
that specificities of the 3 methods for diagnosing
hip dysplasia in dogs at 8 months of age were
similar. However, the DLS score had higher sensitivity,
indicating that there were fewer false-negative
results. (J Am Vet Med Assoc 2001;219:1242–1246)