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Scientific Abstracts healthy controls (p<0.001 vs. SSc and RA). The frequency of vertebral (25% and 19%) and non-vertebral fracture (23% and 22%) did not differ between SSc and RA. Multivariate analysis identified disease duration as the only risk factor of OP in SSc (odds ratio, OR: 1.21, 95% confidence interval, CI: 1.02-1.30). There was no association between OP and corticosteroid intake, cumulative dose of corticosteroids, systemic inflammation (CRP >10mg/l) or any SSc feature Age (OR: 1.21, 95% CI 1.03-1.38) and low 25(OH)D levels (OR: 6.02, 95% CI 1.46-24.78) were recognized as risk factors of fracture in SSc. In comparison, age (OR: 1.12, 95% CI 1.02-1.26) and corticosteroid treatment (OR: 3.21, 95% CI: 1.12-10.44) were independently associated with OP in RA. Cumulative dose of corticosteroids negatively correlated with BMD measured at lumbar spine (r=0.38, p=0.01) and total hip (r=0.49, p=0.008) in RA patients. Multivariate analysis confirmed age (OR: 1.09, 95% CI 1.03-1.18), OP (OR: 3.22, 95% CI 1.18-8.75) and low 25(OH)D levels (OR: 4.31, 95% CI 1.29-14.41) as independent risk factors of fractures in RA. Conclusions: The prevalence of OP and fracture in SSc was increased compared to healthy women and reached the high prevalence associated with RA. Age and vitamin D deficiency were identified as risk factors of fracture in SSc. Thus, increasing the awareness and performance of BMD measurements together with vitamin D supply in patients with SSc is warranted.

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