Sexual Dimorphism in Cortical and Trabecular Bone Microstructure Appears During Puberty in Chinese Children
Publication in refereed journal


摘要Distal forearm fractures during growth are more common in males than females. As metaphyseal cortical bone is formed by coalescence of trabeculae emerging from the periphery of the growth plate, we hypothesized that the later onset of puberty in males produces a longer delay in trabecular bone formation and coalescence which leaves a transient phase of high cortical porosity, low matrix mineral density and high trabecular density relative to females. We quantified the non-dominant distal radial microstructure using high-resolution peripheral quantitative computed tomography in 214 health Chinese boys and 219 Chinese girls aged between 7 and 17 years living in Hong Kong. Measurements of 110 slices (9.02 mm) were acquired 5 mm proximal to the growth plate of the non-dominant distal radius. Porosity was measured using StrAx1.0 and trabecular plate and rod structure were measured using Individual Trabecula Segmentation (ITS). Mechanical properties were estimated using finite element analysis (FEA). Results were adjusted for age, total bone cross sectional area (CSA), dietary calcium intake and physical activity. In boys, total bone CSA was 17.2-22.9% larger throughout puberty, cortical/total bone CSA was 5.1% smaller in Tanner stage 2 only, cortical porosity was 9.4-17.5% higher, and matrix mineral density was 1.0-2.5% lower in Tanner stage 2 to 5, than girls. Boys had higher trabecular rod BV/TV in Tanner stage 3 and 4, but higher trabecular plate BV/TV and plate to rod ratio in Tanner stage 5, than girls. Boys had 17.0% lower apparent modulus than girls in Tanner stage 2. A transient phase of higher porosity due to dissociation between bone mineral accrual and linear growth may contribute to higher distal radial bone fragility in Chinese boys than girls.
著者Cheuk K. Y., Wang X. F., Wang J., Zhang Z., Yu F. W. P., Tam E. M. S., Hung V. W. Y., Lee W. Y. W., Ghasem-Zadeh A., Zebaze R., Zhu T. Y. , Guo X. E., Cheng J. C. Y., Lam T. P., Seeman E.
期刊名稱Journal of Bone and Mineral Research
關鍵詞Adolescent, Bone, Chinese, Microstructure, Puberty, Sex

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