Occurrence and relative risks for non-vertebral fractures in patients with ankylosing spondylitis compared with the general population : a register-based study from Sweden
OBJECTIVES: To estimate the incidence of non-vertebral fractures in ankylosing spondylitis (AS) compared with the general population. METHODS: Nationwide register-based cohort study including patients with AS (n=11 611, 65% men, mean age 48 years), and matched general population controls (n=58 050). Five prespecified fracture outcomes: (1) non-vertebral; (2) fracture of the proximal humerus, dista