Forearm Bone Density, Cross-sectional Size and Muscle Cross-sectional Area in Adolescents with Diabetes Mellitus Type 1 Assessed by Peripheral Quantitative Computed Tomography
Overview
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Objectives: The mechanical components of bone strength (size, shape and density) in adolescents with T1DM are not extensively studied.
Methods: The studied group comprises 39 adolescents, aged 11,9-18,0 yrs. The bone and muscle properties were investigated at the forearm (66% and 4% site). All measurements were performed using pQCT method.
Results: The mean Z-score calculated for the ratio of the total cortical bone cross-sectional area to muscle cross-sectional area at 66% was lower than zero in girls (-0,93+/-1,06; p=0,0042). Significant differences between Tanner stages were noted in boys for mean Z-scores for bone masses, cross-sectional dimensions and strength.
Conclusions: T1DM girls revealed a decreased ratio of cortical bone area/muscle area, reflecting disturbed adaptation of the cortical shaft to the muscle force. When the Z-scores of cortical shell dimensions were investigated, cases in Tanner stage 5 diverged from "less mature" individuals, which may suggests that bone shaft development in these individuals was impaired, affecting both size and strength.
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