Rheumatoid Arthritis Morning Stiffness Is Associated With Synovial Fibrin and Neutrophils

Objective Morning stiffness is a hallmark symptom of rheumatoid arthritis (RA), but its etiology is poorly understood. This study was undertaken to determine whether any histologic features of synovium are associated with this symptom. Methods Data on patient‐reported morning stiffness duration and severity, and Disease Activity Score in 28 joints (DAS28) were collected from 176 patients with RA undergoing arthroplasty. Synovium was scored for...