III : Marked restriction , with an ability to perform most activities of
daily living and occupation Class IV : Incapacitation with confinement
to bed or wheelchair (Arnett FC , 1992 .
Some of the differential diagnosis of RA include Acute viral arthritis ,
sarcoidosis , SLE , polyarticular gout , erosive osteoarthritis ,
polymyalgia rheumatica , psoriatic arthritis , reactive arthritis ,
polymyositis and calcium pyrophosphate disease . These are...