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In page Osselet:

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Osselets refers to the inflammation of the connective tissue that is around the canyon bone and the fetlock joint. Inflammation can involve arthritis and can become a degenerative joint disease. The condition is a job risk for young thoroughbreds and is usually caused by stress and due to the trauma of repeated hard training in young horses. The first thing that appears on a horse with osselets is a swelling in the front part of the fetlock joint, there may be synovial strains on the sides of the joint. It is painful for the horse to flex the joint and usually causes lameness.[1]