As the diseases to be discussed are usually designated by the practitioner as chronic rheumatism, this title is chosen. Under this title are two distinct diseases, each differing from the other in etiology, pathology and clinical signs and symptoms. The only points in common are chronicity and involvement of the joints.
As the mortality from either type is practically nil, there are no statistics in this country to indicate the incidence of the two diseases. In England, with its industrial insurance, statistics are available. Glover1 reported: ". . . In any 1,000 insured males of all ages there will be found one case of rheumatoid arthritis and three cases of osteoarthritis. . . . In any 1,000 insured females of all ages, we should expect three cases of rheumatoid arthritis and two of osteoarthritis." The figures on osteo-arthritis include only the cases of persons who consult the panel doctor on account of discomfort from the