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Differential diagnosis of a swollen hock in the horse

THE tarsus is an extremely complex articulation that is a frequent site of pathology in the horse. Within the tarsus, there is an intricate relationship between the synovial structures, bones, ligaments and tendons, all of which are often involved in pathological processes. It is essential that the anatomical structure(s) and significance of any swelling of the tarsus are correctly identified during clinical examination of the lame horse. This article describes various conditions which might cause a swollen hock in the horse.