Fig. 4

Labelling of lesions in the hock joint. a Pig 5. There is an osteochondrosis lesion proximo-dorsally in the medial trochlear ridge of the talus, labelled green. b Pig 10. There is a cyst-like osteochondrosis lesion proximally in the lateral trochlear ridge, labelled blue. c Pig 8. There is an osteochondrosis lesion disto-laterally in the caput of the talus, labelled blue. d Pig 31. The arrow points to a large, irregular and cyst-like defect at the collum of the talus. The defect has deliberately not been labelled as a lesion because there is currently no validated size threshold for distinguishing between normal nutrient foraminae and lesions in this location. (Fig. 4d appears smoother because it was exported from the original CT scan via free software [https://horosproject.org/], rather than from the labelling application)