Abstract
ABSTRACT The aim of this study was to test the accuracy of a new automated computer software tool for the assessment of passive hip laxity. The hip laxity was estimated using the dedicated computer software by two blinded evaluators, one previously trained and one without specific training for distraction index measurement, in two independent sessions using 230 hip joints from 115 dogs that underwent screening for passive hip laxity using the distraction view. Previously, all of these radiographs were sent to PennHIP Analysis Center for an official distraction index record. The measurement repeatability of the two sessions was adequate for both evaluators. The reproducibility of the official distraction index measurement, mean distraction index±standard deviation 0.44±0.15, was adequate (P>0.05) for the trained evaluator, 0.44±0.15, and non-adequate (P<0.05), for the non-trained evaluator 0.47±0.17. The distraction index measurement tool proposed can be used with confidence for hip laxity evaluation by trained evaluators, as it provided good repeatability and reproducibility of official reports. The simplicity of the process described leads to a less time-consuming and more affordable procedure.
Highlights
Hip dysplasia is a hereditary orthopaedic disorder affecting dogs (Gaspar et al, 2016; Martins et al, 2017a)
The hip laxity was estimated using the dedicated computer software by two blinded evaluators, one previously trained and one without specific training for distraction index measurement, in two independent sessions using 230 hip joints from 115 dogs that underwent screening for passive hip laxity using the distraction view
The predisposition to the development of hip dysplasia in adult animals may be assessed in dogs over four months, by hip joint laxity evaluation (Smith et al, 1990)
Summary
Hip dysplasia is a hereditary orthopaedic disorder affecting dogs (Gaspar et al, 2016; Martins et al, 2017a). It was first described in 1935, and since has been the subject of intense investigation (Schnelle, 1935). Screening is based in the assessment of stablished parameters, taking into account characteristic radiographic degenerative joint signs, observed on the standard ventrodorsal hip-extended view, in dogs over one year of age (Verhoeven et al, 2007; Bausman and Wendelburg, 2010). Hip laxity is considered the main risk factor for development of dysplasia (Smith et al, 1990; Farese et al, 1999; Ginja et al, 2008a)
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