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Abstract
The aim of this study was to evaluate atlanto-axial and sub-axial joints affection by MRI, and to correlate these findings with clinical, some laboratory data and plain X-ray in RA patients and polyarticular JRA. The Study included 54 Subjects. They were classified into three groups: group I: It included 15 patients with RA, 2males (13.3%) and 13 females (86.7%), their ages ranged from 25 to 60 years with a mean S.D of 41.7 8.3 years. The duration of the disease ranged from 5 to 18 years with a mean S.D of 9.4 4.2 years. All Patients were diagnosed according to A.R.A. criteria. group II: It included 15 patients with polyarticular JRA, 4 males (26.7%) and 11 Females (73.3%), their ages ranged from 5 to 30 years with a mean S.D of 15.9 6.9 years. The duration of disease ranged from 2 to 22 years with a mean S.D of 7.8 5.5. All patients were diagnosed according to A.C.R. criteria. group III: It included 24 apparently healthy volunteers, divided into.