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Summary The aim of this study is to investigate the disease of osteochondrosis in horses in a more detailed way. This was performed as an interdisciplinary project with working groups at three different German universities. As introduction, the literature on the complexity of osteochondrosis in the fetlock joint (aetiology, pathogenesis, incidence, localisation and x-ray diagnosis) is discussed. During the study, 630 warmblooded foals, aged 3 up to 10 months, were x-rayed once. In addition, 596 mares were x-rayed, too. These radiographes were evaluated according to localisation, kind of findings and incidence of ,.joint mice" in the fetlock joint as well as a correlation to OCD. It was established that 16,6% of 630 examined foals did have ?joint mice" in the fetlock joint. It was found that 9% of the foals showed an irregular structure of the sagittal ridge of the dorsal part of the fetlock joint. This was diagnosed as an early form of osteochondrosis. The incidence of osteochondrosis in this study was found to be in the sagittal ridge of the dorsal part of the fetlock joint at 11,9% of the foals, at 5,7% of the foals in the dorsal part of the metacarpus/metatarsus III and the palmar/plantar aspect of the fetlock joint. Female horses were significantly more often affected than male horses. Significant accumulation according to month of birth, age as well as size of stud-farm could not be stated. The incidence in different groups of offspring varied considerably. 8,9% of the mares of there specific foals showed a OCD lesion on the sagittal ridge whereas 11,7% of the mares had ?joint mice" in other localisations. Comparing osteochondrotic lesions in warmblooded mares and their foals revealed no dependence.