Upper Cervical Abnormality of Rheumatoid Arthritis

Rheumatoid arthritic changes in the upper cervical spine was studied radiologically in 209 cases with RA. Atlanto-axial dislocation was found in 39% of them and vertical displacement of Cl in 11%. For diagnosis of vertical displacement of Cl, Ranawat's and Redlund-Johnell's methods were discussed.