Abstract
This study aimed to investigate the prevalence of juvenile osteochondral conditions (JOCCs) in yearling Thoroughbred (TB) racehorses in Southern Brazil, as well as to examine the same animals studied as weanlings by Bastos et al. (2017) and compare the radiographic findings for the two ages. Radiographs of 76 male and female TB yearlings from Paraná State, Southern Brazil, were investigated. The proximal interphalangeal, metacarpophalangeal/metatarsophalangeal (MC/MT), tarsal, and femorotibial (FT) joints were evaluated using 24 radiographic projections. The evaluation consisted of a severity index (rated as 0, 1, 2, 4, or 8), the sum of which resulted in an osteoarticular status (OAS) of good, intermediate, or poor for each animal. Radiographs of 92% of the investigated animals presented at least one finding consistent with JOCCs. The most affected region was the tarsal joint (72.9%), followed by the FT (50%), MT (25%), and MC (23%) joints. Thirty-three (43.4%) horses presented a decline in their OAS, whereas nine (11.8%) presented an improvement from the weanling to yearling age. The radiographic findings suggest that JOCCs are frequent in TB yearlings, but the meaning and relevance of these radiographic findings require further study.
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