Objective—To determine the radiographic methods
that best predict the development of osteoarthritis in
the hip joints of a cohort of dogs with hip dysplasia
and unaffected dogs.
Animals—205 Labrador Retrievers, Greyhounds, and
Labrador Retriever-Greyhound crossbred dogs.
Procedure—Pelvic radiography was performed when
the dogs were 8 months old. Ventrodorsal extendedhip,
distraction, and dorsolateral subluxation (DLS)
radiographs were obtained. An Orthopedic
Foundation for Animals-like hip score, distraction
index, dorsolateral subluxation score, and Norberg
angle were derived from examination of radiographs.
Osteoarthritis was diagnosed at the time of necropsy
in dogs ≥ 8 months of age on the basis of detection
of articular cartilage lesions. Multiple logistic regression
was used to determine the radiographic technique
or techniques that best predicted development
Results—A combination of 2 radiographic methods
was better than any single method in predicting a cartilage
lesion or a normal joint, but adding a third radiographic
method did not improve that prediction. A
combination of the DLS score and Norberg angle best
predicted osteoarthritis of the hip joint or an unaffected
hip joint. All models that excluded the DLS score
were inferior to those that included it.
Conclusions and Clinical Relevance—A combination
of the DLS score and Norberg angle was the best
predictor of radiographic measures in 8-month-old
dogs to determine whether a dog would have normal
or osteoarthritic hip joints. (Am J Vet Res 2003;64:1472–1478)