The diagnosis of locomotor disorders in horses is of great importance, as they are limiting factors for the use of these animals in sports and for their trade. Calcification of the alar cartilage can occur due to physiological or environmental factors, without causing dysfunction to the animal, but fractures of this calcified cartilage can cause clinical signs of lameness. Just like calcification of the alar cartilage, osteochondritis dissecans is also another condition of multifactorial origin, being likely to affect any species of mammals that are in the growth phase. The use of complementary exams, such as radiographic exams, contributes favorably to diagnoses and facilitates the evaluation and classification of injuries, favoring the performance of activities and the trade of horses.