we reviewed the records of 44 patients , retrospectively selected because they had had persistently active rheumatoid arthritis for more than 5 years ( mean +/- sd followup 9.8 +/- 2.6 years ) and because they met the american rheumatism association criteria for classic disease , to determine the change in extent of the anatomic distribution of joint involvement over time .
C0003873
rheumatoid arthritis
C0022417
joint