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. 2023 Nov;75(11):2379-2388.
doi: 10.1002/acr.25137. Epub 2023 Jul 13.

Clinical Features Associated With Rate of Fractures in Patients With Systemic Sclerosis: A US Cohort Study

Bliss Rogers  1 , Sina Famenini  1 , Jamie Perin  1 , Maria I Danila  2 , Kristin Wipfler  3 , Kaleb Michaud  4 , Zsuzsanna H McMahan  1
Affiliations

Clinical Features Associated With Rate of Fractures in Patients With Systemic Sclerosis: A US Cohort Study

Bliss Rogers et al. Arthritis Care Res (Hoboken). 2023 Nov.

Abstract

Objective: Systemic sclerosis (SSc) is associated with several specific risk factors for fracture due to the complications of the disease and related medications. The present study was undertaken to examine the relationship between SSc-associated clinical features and fracture rate in a large US cohort.

Methods: Participants with SSc in FORWARD, The National Databank for Rheumatic Diseases, were included (1998-2019). Age- and sex-matched individuals with osteoarthritis (OA) from the same database were included as comparators. The primary end point was self-reported major osteoporotic fracture. Cox proportional hazards models were used to study the associations between risk factors and fractures.

Results: The study included 922 individuals (SSc patients, n = 154; OA patients, n = 768). Eighty-seven percent were female, with a mean age of 57.8 years. Fifty-one patients developed at least 1 fracture during a median of 4.2 years (0.5-22.0 years) of follow-up. Patients with SSc had more frequent fractures compared to OA comparators (hazard ratio [HR] 2.38 [95% confidence interval (95% CI) 1.47-3.83]). Among patients with SSc, a higher Rheumatic Disease Comorbidity Index score (HR 1.45 [95% CI 1.20-1.75]) and a higher Health Assessment Questionnaire disability index score (HR 3.83 [95% CI 2.12-6.93]) were associated with more fractures. Diabetes mellitus (HR 5.89 [95% CI 2.51-13.82]) and renal disease (HR 2.43 [95% CI 1.10-5.37]) were independently associated with fracture among SSc patients relative to SSc patients without these comorbidities.

Conclusion: Our findings highlight factors associated with fracture among patients with SSc. Disability as measured by the HAQ DI is a particularly strong indicator of fracture rate in SSc. Improving SSc patients' functional status, where possible, may lead to better long-term outcomes.

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Conflict of interest statement

Declarations of interest disclosures: None.

Figures

Figure 1.
Figure 1.
Causal diagram illustrating the relationships between scleroderma and its clinical features, bone fragility, and fracture.
Figure 2.
Figure 2.
Kaplan-Meier estimates for the percent fracture free over the duration of the study (years), by HAQ-DI and for systemic sclerosis (SSC) and osteoarthritis (OA) patients
Figure 3.
Figure 3.
Kaplan-Meier estimates for the percent fracture free over the duration of the study (years), for systemic sclerosis (SSC) and osteoarthritis (OA) patients
See this image and copyright information in PMC

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