Osteoarticular felons are diseases of the nail phalanx of the same toe. They arise as a result of the transition of the inflammatory process to the bone, joints of the nail phalanx or to the articular part of the finger. Such felons can develop independently, as well as against the background of deep damage to the phalanx and soft tissues of the area around the nail. Also, such inflammation can occur with diabetes and syphilis. The nail phalanx, which acts as a bony part, forms a joint with the interphalangeal joint of the finger. If their movements are limited to each other, then blood circulation is disrupted, which leads to the development of the disease. Osteoarticular felons are divided into intraosseous and extraosseous forms. If the periungual joint is affected, an inflammatory infiltrate forms under the nail plate, and it cannot move. With total felon they become inflamed