Arthrosis is accompanied by a degeneration of the articular cartilage and painful inflammatory reactions in horses. They can be due to age, limb defects, working conditions... Joint pain is responsible for stiffness or varying levels lameness when cold, prior to exercise. Synovitis provokes swelling of synovial joint recesses (galls and spavins). Joint crepitus can develop as the conditions reaches maturity. This pathology is very disabling for sports, racing or leisure horses. If it is detected and managed very early, it may be possible to delay the development of cartilage lesions and provide the horse with relief.