title: Comparison of clinical, radiographic, computed tomographic, and magnetic resonance imaging methods for early prediction of canine hip laxity and dysplasia.
abstract: The purpose of the study was to use two palpation methods (Bardens and Ortolani), a radiographic distraction view, three computed tomography (CT) measurements (dorsolateral subluxation score, the lateral center-edge angle, and acetabular ventroversion angle) and two magnetic resonance (MR) imaging hip studies (synovial fluid and acetabular depth indices) in the early monitoring of hip morphology and laxity in 7-9 week old puppies; and in a follow-up study to compare their accuracy in predicting later hip laxity and dysplasia. The MR imaging study was performed with the dog in dorsal recumbency and the CT study with the animal in a weight-bearing position. There was no association between clinical laxity with later hip laxity or dysplasia. The dorsolateral subluxation score and the lateral center-edge angle were characterized by a weak negative correlation with later radiographic passive hip laxity (-0.26 < r < -0.38, P < 0.05) but its association with hip dysplasia was not significant. There was an association between early radiographic passive hip laxity and synovial fluid index with later passive hip laxity (0.41 < r < 0.55, P < 0.05) and this was significantly different in dysplastic vs. nondysplastic hips (P < 0.05). There was no association between the remaining variables and later hip laxity or dysplasia. The overlapping ranges of early passive hip laxity and synovial fluid index for hip dysplasia grades and the moderate correlations with the later passive hip laxity make the results of these variables unreliable for use in predicting hip laxity and dysplasia susceptibility.
authors.affiliation: Department of Veterinary Science-CITAB, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal. mginja@utad.pt
authors.forename: Mário M D
authors.initials: MM
authors.lastname: Ginja
authors.forename: António J
authors.initials: AJ
authors.lastname: Ferreira
authors.forename: Sandra S
authors.initials: SS
authors.lastname: Jesus
authors.forename: Pedro
authors.initials: P
authors.lastname: Melo-Pinto
authors.forename: José
authors.initials: J
authors.lastname: Bulas-Cruz
authors.forename: Maria A
authors.initials: MA
authors.lastname: Orden
authors.forename: Fidel
authors.initials: F
authors.lastname: San-Roman
authors.forename: Maria P
authors.initials: MP
authors.lastname: Llorens-Pena
authors.forename: José M
authors.initials: JM
authors.lastname: Gonzalo-Orden
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000473:pathology; D000818:Animals; D000831:Animals, Newborn; D001947:Breeding; D004283:Dog Diseases / Q000175:diagnosis* / Q000000981:diagnostic imaging; D004285:Dogs; D005260:Female; D006619:Hip Dysplasia, Canine / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006621:Hip Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D007593:Joint Instability / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000662:veterinary*; D008279:Magnetic Resonance Imaging / Q000379:methods / Q000662:veterinary; D008297:Male; D010173:Palpation / Q000662:veterinary; D010808:Physical Examination / Q000662:veterinary; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods / Q000662:veterinary