Osteoarthritis is related as one of the most common causes of lameness in horses, causing great economic losses and animal welfare due to pain. The articular cartilage is the central point of the development of the pathology, however, the subchondral bone and the synovial membrane have functions at the joint level since they allow the adequate dissipation of the biomechanical forces and the joint lubrication. The synovial membrane allows the production of synovial fluid, production of inflammatory cytokines and extracellular matrix degrading enzymes, which trigger the degenerative activity of osteoarthritis, since it promotes the damage of the articular cartilage and subsequently the subchondral bone. There are several diagnostic imaging techniques that can be used in the evaluation of the pathology, with radiography being the most common, however, it has some disadvantages in comparison with other imaging techniques, since it is not possible to obtain any findings early in the pathology, added to that, the density of the articular cartilage presents little radiological absorption for which the evaluation of the same one is not possible by means of the technique; joint ultrasound allows visualization of soft tissues; The synovial membrane, the synovial fluid and the articular cartilage are anatomical structures that present echographic changes such as: increase in the size of the villi present in the synovial membrane, echogenic changes and variation in the eco texture of the synovial fluid, interruption in the continuity of the articular cartilage , among others.