Joint deformity develops with injuries, inflammatory and degenerative diseases of the joints, is a consequence of congenital anomalies. It is formed in the outcome of diseases, traumatic injuries. It can be detected in the area of one, several or many joints, accompanied by pain, lameness, limitation of movement. The cause of the symptom is established according to the survey, physical examination, radiography, ultrasound of the joints, CT, MRI, laboratory tests. Treatment includes NSAIDs, chondroprotectors, and other means.