TNF Inhibitors Ward Off Fracture in Axial Spondyloarthritis

TOPLINE:

Tumor necrosis factor (TNF) inhibitors protect patients with axial spondyloarthritis (axSpA) from hip and spine fractures better than other drugs.

METHODOLOGY:

• Large US insurance claims database study comparing protective effects of TNF inhibitors vs other drugs on fractures in patients with axSpA.
• The study included 13,519 patients with axSpA aged 18-65 years, of whom 1229 had hip or spine fractures (mean age, 53 years; 38% women) and 12,290 were control participants without fractures.
• Effects of TNF inhibitors, nonsteroidal anti-inflammatory drugs (NSAIDs), conventional synthetic disease-modifying antirheumatic drugs (csDMARDs), or no medication before the fracture were compared.
• The primary outcome was a composite hip and/or spine fracture, and the secondary outcome was a spine fracture.

TAKEAWAY:

• TNF inhibitor users had a lower risk for hip and spine fractures (adjusted odds ratio [aOR], 0.75; 95% CI, 0.62-0.91) than NSAID users, but this protective association was not seen in csDMARD users.
• Sex-stratified analysis showed similar protective effects of TNF inhibitors in both women and men.
• TNF inhibitor users showed a significantly lower risk for spine fractures than NSAID users (aOR, 0.81; 95% CI, 0.66-0.99).
• The protective effect of TNF inhibitors on hip and spine fractures was also seen in patients with a history of prior fractures; however, the effect was not statistically significant.

IN PRACTICE:

“Our findings underscore the multifaceted benefits of TNF inhibitors in axSpA,” the authors wrote.

SOURCE:

Devin Driscoll, MD, Section of Rheumatology, Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, led the study, published online on December 16, 2024, in Arthritis & Rheumatology.

LIMITATIONS:

Identification of the axSpA cohort and fracture outcomes was based solely on diagnostic and procedure codes, which may have led to misclassification. The administrative database lacked detailed information on disease activity levels, and the high proportion of missing data for body mass index, a known strong confounder for fracture risk, may have introduced bias. There were insufficient numbers of hip fractures to conduct analyses limited solely to hip fractures.

DISCLOSURES:

The study was supported by R03 AR076495 and NIH P30 AR072571. Two authors declared receiving grants, contracts, payments, honoraria, and other affiliations with various institutions and pharmaceutical companies.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.