Purpose: Areal bone mineral density (aBMD) by DXA is underestimated in those with smaller bones and overestimated in those with larger bones. Trabecular bone score (TBS) predicts fracture risk, and is not influenced by bone size. The aim of this study was to evaluate TBS and BMD in women with short stature.
Methods: We retrospectively analyzed DXA scans of all women aged 50-90 years with short stature (<144 cm) obtained in a single center, from 2006 to 2016. The comparison group comprised women >161 cm in height, matched for age and LS BMD, selected from the same database.
Results: The study population included 342 women. The two groups were similar in age, and aBMD at the LS and total hip. Femoral neck aBMD was lower in cases than in taller women. In contrast, TBS was higher in women with short stature than in their taller counterparts (1.347 ± 0.102 vs. 1.250 ± 0.110; p < 0.001). Bone mineral apparent density (BMAD) and the LS TBS-adjusted BMD T-score were also significantly higher in shorter than in taller women. From the entire cohort, 121 women (67 cases) were osteoporotic by aBMD determinations. Among these subjects, TBS was also greater in cases (1.303 ± 0.103) than in women with standard height (1.190 ± 0.099; p < 0.001). Despite being considered osteoporotic, 36% of short women, but none of the taller ones, had a normal TBS.
Conclusions: TBS can be a useful adjunct to aBMD for assessing bone quality in short women, in whom aBMD measurement tends to read lower, and, thus could overestimate fracture risk.
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