Bone Quality Deterioration Linked to Inflammation in HIV Immunological Nonresponders

Overview

This cross-sectional study found that people with HIV who are immunological nonresponders (INRs) exhibit significantly poorer bone quality compared to immunological responders (IRs), despite similar bone mineral density (BMD). Elevated inflammation markers and lower vitamin D levels in INRs correlate negatively with bone quality, suggesting inflammation as a key factor in bone deterioration.

Background

Chronic HIV infection is associated with multiple non-AIDS comorbidities, including compromised bone health and increased fracture risk. Immunological nonresponders (INRs) represent a subgroup of people with HIV (PWH) who, despite effective antiretroviral therapy (ART) and viral suppression, fail to restore adequate CD4+ T-cell counts and experience higher rates of adverse health outcomes. Bone quality assessment traditionally relies on bone mineral density (BMD), but newer techniques like in vivo microindentation provide deeper insights into bone mechanical strength and quality. Understanding bone health in INRs is critical to addressing their elevated risk of skeletal complications.

Data Highlights

Key Findings

• INRs have significantly lower bone material strength index compared to IRs, indicating poorer bone quality despite similar BMD.
• INRs exhibit elevated levels of high-sensitive C-reactive protein, reflecting increased systemic inflammation.
• Lower serum 25-(OH)-vitamin D3 levels were observed in INRs compared to IRs.
• A significant negative correlation exists between inflammation markers and bone quality, particularly pronounced in INRs.
• Multivariable regression identified INR status as an independent predictor of decreased bone quality, beyond conventional risk factors.

Clinical Implications

Clinicians should recognize that INRs are at heightened risk for bone quality deterioration not detectable by BMD alone, emphasizing the need for advanced bone assessment techniques such as in vivo microindentation. Monitoring and managing systemic inflammation and vitamin D deficiency in this population may be critical to preserving skeletal health. Tailored interventions targeting inflammation could potentially mitigate bone fragility in INRs.

Conclusion

Immunological nonresponse in people with HIV is associated with impaired bone quality linked to increased inflammation and lower vitamin D levels, independent of traditional bone density measures. These findings highlight the importance of comprehensive bone health evaluation and inflammation management in this vulnerable subgroup.

References

1. Hospital del Mar Study Group 2023 -- Bone Quality Deterioration Linked to Inflammation in HIV Patients with Inadequate Immune Response