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PQCT bone geometry and strength: population epidemiology and concordance in Australian children aged 11-12 years and their parents
journal contribution
posted on 2019-01-01, 00:00 authored by J Vlok, P J Simm, Kate LycettKate Lycett, S A Clifford, A C Grobler, K Lange, N Ismail, W Osborn, M WakeObjectives To describe the epidemiology and concordance of bone health in a population-based sample of Australian parent-child dyads at child age 11-12 years. Design Population-based cross-sectional study (the Child Health CheckPoint) nested between waves 6 and 7 of the Longitudinal Study of Australian Children (LSAC). Setting Assessment centres in seven cities around Australia, February 2015-March 2016. Participants: Of all participating CheckPoint families (n=1874), bone data were available for 1222 dyads (1271 children, 50% girls; 1250 parents, 86% mothers). Outcome measures Peripheral quantitative CT (pQCT) of the non-dominant leg scanned at the 4% (distal) and 66% (mid-calf) tibial sites. Stratec XCT 2000 software generated estimates of bone density, geometry and polar stress-strain index. Parent-child concordance were assessed using Pearson's correlation coefficients and multivariable linear regression models. Percentiles were determined using survey weights. Survey weights and methods accounted for LSAC's complex sampling, stratification and clustering within postcodes. Results Concordances were greater for the geometric pQCT parameters (periosteal circumference 0.38, 95% CI 0.33 to 0.43; endosteal circumference 0.42, 95% CI 0.37 to 0.47; total cross-sectional area 0.37, 95% CI 0.32 to 0.42) than density (cortical density 0.25, 95% CI 0.19 to 0.30). Mother-child and father-child values were similar. Relationships attenuated only slightly on adjustment for age, sex and body mass index. Percentiles and concordance are presented for the whole sample and by sex. Conclusions There is strong parent-child concordance in bone geometry and, to a lesser extent, density even before the period of peak adolescent bone deposition. This geometrical concordance suggests that future intergenerational bone studies could consider using pQCT rather than the more commonly used dual X-ray absorptiometry (DXA).
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Journal
BMJ openVolume
9Issue
Suppl 3Pagination
63 - 74Publisher
BMJ Publishing GroupLocation
London, Eng.Publisher DOI
Link to full text
eISSN
2044-6055Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2019, Author(s) (or their employer(s))Usage metrics
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pQCT bonegeometrystrengthAustralian childrenScience & TechnologyLife Sciences & BiomedicineMedicine, General & InternalGeneral & Internal Medicinebone healthPeripheral Quantitative Computer Tomography (pqct)reference valueschildren patternsepidemiologic studiesQUANTITATIVE COMPUTED-TOMOGRAPHYX-RAY ABSORPTIOMETRYMINERAL DENSITYCORTICAL BONEPERIPHERAL QCTFRACTURE RISKOSTEOPOROSISADOLESCENTSTIBIAMASS
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