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Foram estudadas radiograficamente as articulações coxofemorais de 60 cães de diferentes raças (32 fêmeas e 28 machos), com o objetivo de se estabelecer o diagnóstico precoce da displasia coxofemoral (DCF). Os exames foram feitos em idade jovem (7,2± 1,2 meses) e repetidos em idade adulta (14,4± 1,6 meses). Utilizaram-se os métodos radiográfico convencional (MRC) e radiográfico por distração (MRD), feito com o auxílio de um dispositivo, especialmente idealizado e confeccionado para o experimento. Observou-se correlação (P<0,001) entre o índice de distração (ID) no primeiro exame e o ângulo de Norberg (AN) no segundo exame. O valor de referência do ID foi de 0,35. Os animais com ID superior ao valor de referência apresentaram sinais radiográficos de doença articular degenerativa (DAD). Quanto maior o ID, maior o grau de displasia e, por conseguinte, maior os achados radiográficos de DAD. Quatro cães considerados normais pelo MRC no segundo exame, tiveram ID superior a 0,35 no primeiro exame, o que mostra existência de animais falsos negativos pelo método convencional. Três cães considerados displásicos apresentaram ID inferiores a 0,35, dois deles classificados como suspeitos pelo MRC, o que comprova a natureza indefinida da categoria. A associação entre o MRC e o método radiográfico proposto, na avaliação da DCF em idade precoce, aumenta a eficiência do diagnóstico, pois é capaz de predizer o fenótipo na idade adulta. Aiming the canine hip dysplasia (CHD) early diagnosis, 60 dogs of both sexes (32 females and 28 males) and of different breeds had their hip joints radiographically studied. The X ray examinations were taken in early age (7.2± 1.2 months) and repeated at adult age (14.4± 1.6 months) using the conventional radiographic method (CRM) and the radiographic distraction method (RDM) performed, by its turn, with a new device, specially designed or this experiment. In order to quantify the relationship between the femoral head and the acetabulus the Norberg Angle (NA) was measured at CRM and the distraction index (DI) was calculated at RDM. There was a significant statistical correlation (P<0.001) between DI of the first examination and NA of the second examination. The cut off for sick and normal subjects for DI was 0.35. The dogs with DI values greater than 0,35 presented radiographic signals of degenerative joint disease (DJD). Interestingly, the highest was the DI; the greatest were the radiographic signals of DJD. Four animals considered normal when CRM was performed at second examination had DI superior than 0.35 at first examination. This fact shows that false negative results can occur when only the conventional method is used. Two of three sick dogs that had DI values bellow 0.35 were classified as borderline by CRM. This confirms the indefinite of this class. The association of CRM and the proposed method showed to be extremely useful in early age CHD diagnosis, as it can predict the adult age phenotype

Distrator articular no diagnóstico radiográfico precoce da displasia coxofemoral em cães