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Fibrodysplasia ossificans progressiva(or Stone Man Syndrome) - is a condition where if fibrous tissue (such as muscle) becomes damaged, the mutated repair system attempts to heal the wound by ossifying it (osteogenesis - the process of creating new bone). In short your body fills damaged areas with bone. This can lead to joints becoming completely mobile. Surgical attempts to remove the extra bone normally leads to the body repairing the affected area with more bone.