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Gazzetta Medica Italiana Archivio per le Scienze Mediche 2017 July-August;176(7-8):402-7

DOI: 10.23736/S0393-3660.16.03349-0

Copyright © 2016 EDIZIONI MINERVA MEDICA

language: English

Bone mineralization density in children according to the chronological and bone age

Mariana ŠELINGEROVÁ 1, Peter ŠELINGER 1 , Ladislava DOLEŽAJOVÁ 1, Emöke ŠTEŇOVÁ 2

1 Faculty of Physical Education and Sports, Comenius University, Bratislava, Slovak Republic; 2 First Department of Internal Medicine, Comenius University Medical School, University Hospital Bratislava, Bratislava, Slovak Republic


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BACKGROUND: The chronological age of children and adolescents may differ significantly from their biological age. In practice, we encounter situations in which the difference between chronological age and bone age in puberty varies between ±3 years.
METHODS: We examined differences in 124 young athletes (68 boys and 56 girls) aged 9 - 18 years. BMD at the left hip (LH) and lumbar spine (LS) was identified by dual X-ray absorptiometry (DXA) and skeletal maturity using the TW3 method. The difference of methodologies for BMD in the chronological and bone age was statistically processed, visualized in a histogram graphically illustrated using the Bland-Altman method. Greater variance in bone mineralization was found in athletes according to chronological age than by bone age.
RESULTS: The average BMD differences against the population of the same age were lower in boys (Z-score LS=0.09, and LH =0.10) than girls (Z-score LS=0.21, and LH=0.17). The minimum and maximum of Z-score confirm our assumption that young athletes are individuals with very high or low levels of BMD.
CONCLUSIONS: The evaluation of bone mineralization based on chronological and bone age is different. We recommended as part of physical education and medical care to monitor not only the state of BMD against chronological age but to check the individual output evaluations in relation to the bone age of young athletes.


KEY WORDS: Bone density - Child - Adolescent

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