Abstract
This prospective study assessed whether metacarpal indices predict fracture risk in children and adolescents. Radiogrammetry was performed at the second metacarpal midshaft on annual hand–wrist radiographs of 359 South African (SA) children aged 10–17 years. Bone length, bone width, and medullary width were measured, and the following proxies for bone strength calculated: metacarpal index (MCI), bone mineral density (BMD), section modulus (SM), stress–strain index (SSI), and slenderness index (SLI). Height and weight were measured annually. Self-reported physical activity (PA) and fracture history were obtained at ages 15 years (for the preceding 12 months) and 17 years, respectively. At 17 years, 82 (23%) participants (black, 16%; white, 42%; p < 0.001) reported a previous fracture. None of the bone measures or indices were associated with fracture in black participants. In white females, after adjusting for PA, a 1 standard deviation (SD) greater SLI doubled the fracture risk [odds ratio (OR) 2.08; 95% confidence interval (CI) 1.08, 3.98]. In white males, a 1 SD greater BMD was associated with a 2.62-fold increase in fracture risk (OR 3.62; 95% CI 1.22, 10.75), whilst a 1 SD greater SM (OR 2.29; 95% CI 1.07, 4.89) and SSI (OR 2.23; 95% CI 1.11, 4.47) were associated with a more than twofold increase in fracture risk, after height, and PA adjustment. No single index consistently predicted fracture across the four groups possibly due to ethnic and sex differences in bone geometry, muscle mass, and skeletal loading. Metacarpal radiogrammetry did not reliably predict fracture in SA children.
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Acknowledgements
The Bone Health Cohort (BHC) was supported financially by the Wellcome Trust (UK) and the South African MRC. JMP received funding from the National Research Foundation. SAN was supported by the DST-NRF Centre of Excellence in Human Development at the University of the Witwatersrand. The contribution of the BHC staff, participants and caregivers is gratefully acknowledged.
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Study design JMP, SAN, LKM, Analysis of Radiographs AM, Fracture data collection KT, Integrity of data AM and RJM, Data interpretation AM, LKM, JMP, RJM, Drafting and revising manuscript- AM, LKM, SAN, KT, RJM, JMP.
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Ansuyah Magan, L.K. Micklesfield, S.A. Norris, K. Thandrayen, R.J. Munthali, and J.M. Pettifor declare no conflict of interest.
Human and Animal Rights and Informed Consent
This study was approved by the University of the Witwatersrand Committee for Research on Human Subjects and was performed in accordance with the Ethical Standards as laid down in the 1964 Declaration of Helsinki and its later amendments. Informed assent from adolescent participants and consent from parents were obtained for inclusion in this study.
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Magan, A., Micklesfield, L.K., Norris, S.A. et al. Metacarpal Indices and Their Association with Fracture in South African Children and Adolescents. Calcif Tissue Int 104, 14–25 (2019). https://doi.org/10.1007/s00223-018-0467-4
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DOI: https://doi.org/10.1007/s00223-018-0467-4