Examination of radiographs of the hip joints of three dog breeds in regard of hip dysplasia using digital picture analysis

Radiographs of the hip joints of 78 Rhodesian Ridgebacks, 52 Siberian Huskys and 23 Golden Retrievers were examined in regard of hip dysplasia applying traditional methods as well as using a computer supported system of picture analysis. The ratio of the radii of femoral head and acetabulum, the lateral divergence of the femoral head, the dorsal coverage of the femoral head by the acetabular roof and the angle of RIGHTER (1977) were determined using a computer-system. The analysis of hip joints using a computer was advantageous. The measurements could be performed rapidly and accurately. The importance of the parameters was estimated by analysis correlation. As result we recommend to evaluate hip joints as follows: a single parameter cannot be the basis of judgement. More importatnt is a thorough visual analysis of the radiograph for any alterations of the joint. Additionally the angle of NORBERG et al. (1965) should be measured and using a computer supported system of picture analysis the lateral divergence of the femoral head, the dorsal coverage of the femoral head and the angle according to RIGHTER (1977) should be included.