Motion analysis of the wrist joints in Chinese rheumatoid arthritis patients: a cross-sectional study

BACKGROUND: The wrist is often severely affected in rheumatoid arthritis (RA) patients; however, little is known about the potential risk factors of the reduced wrist range of motion. In this study, we explored a broad range of possible risk factors of wrist range of motion in RA patients. We also determined whether measurements of wrist range of motion reflect Sharp score for the wrists. METHODS: Active wrist volar flexion, dorsal flexion, radial deviation and ulnar deviation were assessed using a goniometer. RA patients underwent standardized laboratory and radiographic examinations and completed several questionnaires. A linear regression model was used to study association between the wrist range of motion and independent variables. In addition, Spearman and Pearson correlation analysis were used to compare influence factors and outcome measurements between the measurements of wrist range of motion and Sharp score for the wrists. RESULTS: In this study, lower socioeconomic status, longer disease duration, severe pain, higher disease activity and drug treatments were associated with reduced wrist range of motion in RA patients (n = 102, 86.3% female, mean ± SD age, 55.0 ± 11.7 years, and mean ± SD disease duration, 8.4 ± 8.7 years). Furthermore, wrist range of motion was highly correlated with Sharp score for the wrists (P < 0.05). CONCLUSIONS: Socioeconomic status and disease-specific factors were significantly associated with wrist range of motion in RA patients. The results indicated that rheumatologists and nurses should note the measurements of wrist range of motion in RA patients, especially those with a low socioeconomic status, a long disease duration, severe pain, and high disease activity to develop strategies to improve their quality of life.