Case-based Comparative Imaging (Radiography, Scintigraphy, CT, MRI) of the Tarsus

The equine tarsus is routinely examined with radiography since the tarsus is the most common affected hind limb region associated with lameness. In radiography the complex three dimensional structure of the tarsus is projected two- dimensionally and consequently superimposition of the different bones occurs. Therefore different projections are necessary to project the different parts of the tarsus without superimposition. One of the main indications performing radiographic examinations is Osteochondrosis (OC). Radiographic changes of OC are isolated mineralizations, irregular contours of the subchondral bone, subchondral radiolucencies and/ or sclerosis. Secondary degenerative joint disease may also be visible. The most commonly affected site is the intermediate ridge of the tibia, followed by the lateral trochlear ridge of the talus, the medial malleolus, the medial trochlear ridge and the lateral malleolus. In order to detect OC lesions, projections are used, which show these sites free of superimposition. The standard examination includes a lateromedial view, a dorsoplantar view and the dorsolateral- plantaromedial oblique and dorsomedialplantarolateral oblique view […]