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    The effect of rheumatoid arthritis on upper extremity functions: A kinematic perspective
    (Wiley, 2022) Kabul, Elif Gür; Ünver, Fatma; Alptekin, Ahmet; Korkmaz, Halil; Çalık, Bilge Başakcı; Taşçı, Murat
    Aim To examine the global upper extremity kinematics in 3D while performing jar opening motion in Rheumatoid Arthritis (RA) and to compare these with healthy individuals. Method Twenty-four women (12 healthy, 12 RA) were included. Evaluations were made with a JAMAR dynamometer, Health Assessment Questionnaire, and 3D kinematic analysis of global upper extremity during jar opening motion. The time taken during jar opening motion was analyzed in 2 parts (Part 1, Part 2), with total time: part 1 + part 2. In addition, shoulder-to-table distance; elbow flexion angle; wrist extension angle; the area scanned and angular rotation by arm, forearm and hand were used in the analysis. Results Between groups, there was a statistical difference in: bilateral hand grip strength; part 1, part 2, total time; shoulder-to-table distance; elbow flexion angle; the area scanned by hand; angular rotation of arm and hand in favor of the healthy group (P < .05). In stepwise multiple regression analysis, the most predictive variable for disability was elbow flexion, explaining 53.9% of disability. Conclusion Compared to healthy individuals, individuals with RA have slower motion, more elbow flexion, less hand grip strength, circular pattern in hand, rotation in arm and hand. Increased disability may result in greater load on elbow flexion.