Methods: In this cross-sectional study, we compared clinical characteristics of SSc patients with (SSc-calcinosis) and without calcinosis (SSc-control) seen in the outpatient Rutgers-RWJ Scleroderma Program between 2012 and 2015. Our analysis included clinical characteristics, comorbidities (i.e. osteoporosis), autoantibodies and imaging results. We performed univariable and multivariable regression analyses to determine common factors associated with calcinosis.
Results: There were 215 SSc patients, including 65 SSc-calcinosis (81.5% females) and 150 SSc-without calcinosis (controls, 77% females). SSc-calcinosis patients were older (p = .026) with significantly longer disease duration (20 ± 10.5 years versus 12 ± 8 years, p < .0001). Limited cutaneous scleroderma was more common (54%) in the calcinosis group. Longer disease duration from non-Raynaud symptoms (OR 3.77; 95%CI 1.26, 11.27) and osteoporosis (OR 3.43; 95%CI 1.15, 10.36) remained independently associated with calcinosis.
Conclusions: Calcinosis was common in both limited and diffuse systemic sclerosis; both longer disease duration and osteoporosis were independently associated with calcinosis. Prospective studies are needed to confirm our findings.