This study aimed to examine the age-specific individual discrepancy between lumbar spine (LS) bone mineral density (BMD) and femoral neck (FN) BMD in Japanese women and to compare the significantly different characteristics between the two bone sites. We found a higher prevalence rate of discordance between the two BMD T-score sites, and many patients had a lower LS BMD T-score than FN BMD T-score. We believe that our study makes a significant contribution to the literature because our findings suggest that physicians should assess BMD more carefully in women who have a low body weight or body mass index and parental hip fracture history. For these patients, it is necessary to measure both the LS and FN BMD T-scores for calculating the fracture risk.

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