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Sex differences in trabecular bone microarchitecture are not detected in pre and early pubertal children using magnetic resonance imaging

Modlesky, C. M. and Bajaj, D. and Kirby, J. T. and Mulrooney, B. M. and Rowe, D. A. and Miller, F. (2011) Sex differences in trabecular bone microarchitecture are not detected in pre and early pubertal children using magnetic resonance imaging. BONE, 49 (5). pp. 1067-1072. ISSN 8756-3282

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Abstract

Sex differences in trabecular bone microarchitecture have been reported in adults and adolescents, but studies in children are lacking. The primary aim of this study was to determine if there are sex differences in magnetic resonance imaging (MRI)-based measures of trabecular bone microarchitecture at the distal femur of children. Pre and early pubertal boys (n = 23) and girls (n = 20) between the 5th and 95th percentiles for height, body mass and BMI were studied. Apparent trabecular bone volume to total volume (appBV/TV), trabecular number (appTb.N), trabecular thickness (appTb.Th), trabecular separation (appTb.Sp) and a composite measure of trabecular bone microarchitecture (TBMcom) were assessed at the lateral aspect of the distal femur using MRI. Areal bone mineral density (aBMD), bone mineral content (BMC) and bone area were assessed at the distal femur using dual-energy X-ray absorptiometry (DXA). Tanner staging was used to assess pubertal development. Physical activity was assessed using an accelerometry-based activity monitor. Calcium intake was assessed using diet records. There were no sex differences in age, height, femur length, body mass, physical activity or calcium intake (all P > 0.05). There were no sex differences in any MRI-based measure of trabecular bone microarchitecture. Consistent with the MRI-based measures, there were no differences in aBMD, BMC or bone area from DXA at the distal femur (P > 0.05). appBV/TV, appTb.N, appTb.Th, appTb.Sp and TBMcom were also moderately to strongly related to aBMD (r = 0.73, 0.63, 0.51, − 0.74 and 0.61, respectively, p < 0.001) and BMC (r = 0.84, 0.63, 0.66, − 0.80 and 0.77, respectively, P < 0.001). The findings suggest that there are no differences in measures of trabecular bone microarchitecture at the distal femur of pre and early pubertal boys and girls who are similar in size, physical activity and calcium intake. Future studies with larger sample sizes that cover all pubertal stages are needed to determine if sex differences in trabecular bone microarchitecture emerge at the distal femur and other weight bearing bone sites.

Item type: Article
ID code: 41746
Keywords: Magnetic resonance imaging, distal radius, structural analysis, dual-energy X-ray absorptiometry, children, in-vivo, proximal femur, mineral density, bone microarchitecture, bone structure, physical activity, young adult, cerebral palsy, cortical bone, sex, Endocrinology, Diabetes and Metabolism, Histology, Physiology
Subjects: UNSPECIFIED
Department: Faculty of Humanities and Social Sciences (HaSS) > School of Psychological Science and Health > Physical Activity for Health
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Depositing user: Pure Administrator
Date Deposited: 26 Oct 2012 12:59
Last modified: 27 Mar 2014 10:36
URI: http://strathprints.strath.ac.uk/id/eprint/41746

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