Abstract
Summary
Trabecular bone score, an index of lumbar spine trabecular texture, has not been explored fully in adolescent girls. Our cross-sectional analysis supported the hypothesis that “adult normal” trabecular bone score has been achieved by the end of the first year post-menarche, providing a potential screening tool, independent from bone density.
Introduction
Trabecular bone score (TBS) evaluates lumbar spine (LS) trabecular texture from DXA images. Limited evidence suggests low TBS in pre-pubertal girls. TBS has not been assessed in the context of the key peri-menarcheal bone accrual phase. Thus, we evaluated (1) whether “normal” adult TBS (≥ 1.35) is reached in the first year post-menarche and (2) the role of maturational timing (menarcheal age) and status (gynecological age) in TBS variation.
Methods
For 44 healthy girls aged 11 to 13 years, whole body and LS DXA scans were obtained within 1 year post-menarche. As TBS is optimized for adults and can be affected by body thickness, custom software provided unadjusted “rawTBS” and adjusted for tissue thickness “corrTBS” (TBS iNsight, Medimaps, France). Correlations evaluated menarcheal age and gynecological age as factors in LS bone mineral content (BMC), areal bone mineral density (BMD), and TBS.
Results
Lowest observed TBS exceeded 1.35 (rawTBS = 1.362; corrTBS = 1.352). Menarcheal age correlated negatively with rawTBS (r = − 0.34, p = 0.02), with a similar trend for corrTBS (r = − 0.29, p < 0.06). Gynecological age did not correlate with TBS but was positively correlated with LSBMD (r = + 0.37, p = 0.01). Correlations with body composition variables differed between rawTBS and corrTBS.
Conclusions
In this healthy cohort, “normal” adult TBS is present by 1 year post-menarche, 2 years before projected LS peak bone mass. Thus, TBS may be a useful bone architectural screen during the first post-menarcheal year, enabling intervention to improve structure prior to “peak bone mass”. Longitudinal studies are needed to elucidate TBS development and intervention response.
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Acknowledgments
We are grateful for the assistance of Kristen Hendrickson and Dr. Brittney Bernardoni who worked as study coordinators for the first and second year of this longitudinal study, respectively. We appreciate the hard work and expertise of Jessie Libber, our study DXA technician. We acknowledge funding support from the UW Institute for Clinical and Translational Research (Clinical and Translational Science Award, NIH/NCATS 9U54TR000021) and from the UWHC Sports Medicine Classic Fund.
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Parents of the girls provided informed consent, and girls provided informed assent to participate in the study, as outlined in the study protocol, approved by the home Institutional Review Board, in accordance with the Declaration of Helsinki.
Conflicts of interest
None. At the time of TBS analysis, Renaud Winzenrieth was employed by Medimaps.
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Dowthwaite, J.N., Winzenrieth, R., Binkley, N. et al. A focused evaluation of lumbar spine trabecular bone score in the first year post-menarche. Arch Osteoporos 12, 90 (2017). https://doi.org/10.1007/s11657-017-0388-2
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DOI: https://doi.org/10.1007/s11657-017-0388-2