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Patent Pending Osteochondritis dissecans /ˌɒsti.oʊkɒnˈdraɪtɪs ˈdɪsɨkænz/, often abbreviated to OCD or OD, is a joint disorder in which cracks form in the articular cartilage and the underlying subchondral bone.[1] OCD is caused by blood deprivation in the subchondral bone. This loss of blood flow causes the subchondral bone to die in a process called avascular necrosis.