Abstract
The objective of this study is to assess the prevalence and risk in patients with juvenile onset ankylosing spondylitis (JoAS) complicated with low bone mineral density (BMD). A total of 112 children and adolescents with JoAS were enrolled in the study. Bone mass was measured from the lumbar spine and the left proximal femur using dual-energy X-ray absorptiometry. According to the 2007 International Society of Clinical Densitometry definitions, a Z score of less than −2 was termed as “low BMD.” Stepwise regression analysis was used to investigate associations between low BMD and disease-related factors including gender, age, weight, height, body mass index, disease duration, HLA-B27 antigen, grades of sacroiliitis, Bath AS Disease Activity Index (BASDAI), Bath AS Functional Index (BASFI), patient global assessment (PGA), spine pain, erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP). Low BMD was found in 18 (16.1 %) cases in at least one of the two measured regions. Lumbar spine BMD had negative correlations with BASDAI, BASFI, spine pain, ESR, and CRP (P < 0.05). Hip BMD significantly negatively correlated with BASDAI and PGA (P < 0.05). In conclusion, patients with JoAS are likely to develop low BMD, which may be related to high disease activity.
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Abbreviations
- aBMD:
-
Areal bone mineral density
- AS:
-
Ankylosing spondylitis
- ASAS:
-
Assessment in SpondyloArthritis International Society
- BASDAI:
-
Bath Ankylosing Spondylitis Disease Activity Index
- BASFI:
-
Bath Ankylosing Spondylitis Functional Index
- BMD:
-
Bone mineral density
- BMI:
-
Body mass index
- CRP:
-
C-reactive protein
- DXA:
-
Dual-energy X-ray absorptiometry
- ESR:
-
Erythrocyte sedimentation rate
- ISCD:
-
International Society of Clinical Densitometry
- JIA:
-
Juvenile idiopathic arthritis
- JoAS:
-
Juvenile onset ankylosing spondylitis
- mNY criteria:
-
Modified New York criteria
- PDC:
-
Pediatric Position Development Conference
- PGA:
-
Patient global assessment of disease activity
- SD:
-
Standard deviation
- SpA:
-
Spondyloarthritis
- VAS:
-
Visual analog scale
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Acknowledgments
This study was supported in part by Grants from the National Natural Science Foundation of China (number 81172782).
Human and Animal Rights and Informed Consent
All procedures in the study were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 (5). Informed consent was obtained from all patients for being included in the study.
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Bao, J., Chen, Y. & Bao, YX. Prevalence and Risk Factors of Low Bone Mineral Density in Juvenile Onset Ankylosing Spondylitis. Calcif Tissue Int 95, 108–111 (2014). https://doi.org/10.1007/s00223-014-9867-2
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DOI: https://doi.org/10.1007/s00223-014-9867-2