CERVICAL LESIONS RELATED TO THE SYSTEMIC PROGRESSION IN RHEUMATOID-ARTHRITIS

Study Design. Cross-sectional study of cervical involvement in rheumat oid arthritis. Objectives. To clarify the correlation between the dete rioration of cervical lesions and the systemic progression of rheumato id arthritis. Summary of Background Data. The natural course of cervic al lesions varies. To date, no systemic parameter has been clarified t o predict the progression. Methods. One hundred seventy-three patients with rheumatoid arthritis participated in this study. The authors stu died the progression of cervical lesions and investigated the relation between the types of cervical subluxation at the end of study and the following four variables: the serum level of C-reactive protein, the number of joints with erosion, carpal height ratio, and disease subset (least erosive subset, more erosive subset, and mutilating disease su bset). Results. Of the 173 patients, 55 already had cervical subluxati on before entering the study. During the follow-up period, 44 patients deteriorated radiographically, and 77 (45%) had cervical involvement, including involvement of upper cervical lesions in 65 patients, upper lesions combined with subaxial subluxation in 10, and subaxial sublux ation alone in 2. The upper cervical subluxation progressed in the ord er of anterior atlantoaxial subluxation, atlantoaxial subluxation comb ined with vertical subluxation, and vertical subluxation alone. Deteri oration of upper cervical lesion and occurrence of subaxial subluxatio n were closely correlated with an elevation of serum C-reactive protei n level, an increase in the number of joints with erosion, and a decre ase in the carpal height ratio. The incidence of cervical involvement and the extent of deterioration were different among the disease subse ts. Conclusions. The serum level of C-reactive protein, the number of joints with erosion, and the carpal height ratio correlated closely wi th the extent of the cervical subluxation. The average C-reactive prot ein values during the follow-up period correlated with progression of the cervical lesions. The classification of rheumatoid disease subset was useful for predicting the terminal feature of the cervical lesions .