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Osteoporosis in Systemic Autoinflammatory Diseases: A Case-Control Study.

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Patients with systemic autoinflammatory diseases (SAIDs) like FMF, TRAPS, and MKD do not show increased osteoporosis risk. Bone density and quality were similar to controls, suggesting preserved bone health despite inflammation.

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Area of Science:

  • Rheumatology
  • Bone Metabolism
  • Inflammatory Diseases

Background:

  • Systemic autoinflammatory diseases (SAIDs) involve chronic inflammation.
  • Osteoporosis (OP) is a significant skeletal disorder.
  • The relationship between SAIDs and OP risk requires further investigation.

Purpose of the Study:

  • To evaluate the risk of osteoporosis in adult patients with SAIDs.
  • To compare bone mineral density (BMD), bone quality (TBS), and phosphocalcic metabolism between SAID patients and healthy controls.
  • To analyze inflammatory markers and bone remodeling factors (RANKL, OPG, SAA) in SAID patients.

Main Methods:

  • A cohort of 40 adult patients with Familial Mediterranean Fever (FMF), TNF-Receptor Associated Periodic Syndrome (TRAPS), and Mevalonate Kinase Deficiency (MKD) were compared to 40 healthy controls.
  • Bone Mineral Density (BMD) and Trabecular Bone Score (TBS) were assessed using dual-energy X-ray absorptiometry (DXA).
  • Blood and urine analyses included phosphocalcic metabolites, Receptor activator of nuclear factor kappa-B ligand (RANKL), osteoprotegerin (OPG), and serum amyloid A (SAA).

Main Results:

  • No statistically significant differences in BMD or TBS were observed between SAID patients and controls.
  • Phosphocalcic metabolite levels were comparable between the groups.
  • Patients exhibited significantly higher levels of serum amyloid A (SAA) and osteoprotegerin (OPG) compared to healthy subjects.

Conclusions:

  • Adult patients with FMF, TRAPS, and MKD do not present an elevated risk of osteoporosis.
  • Bone quality and density appear preserved in these SAID patients.
  • Elevated OPG may indicate a protective role in bone homeostasis, potentially counteracting inflammatory effects mediated by SAA.