Site-specific bone mineral density by age strata in older women with proximal femur fractures.

[Purpose] Limited research has been conducted comparing bone mineral density by anatomical site and age strata in older women following proximal femur fractures. Therefore, in this study, we examined the site-specific bone mineral density and age strata in a population of older women with proximal femur factures. [Participants and Methods] We categorized 68 older women with postoperative proximal femur fractures into three groups based on age: 65-79 years (Group I), 80-89 years (Group II), and ≥90 years (Group III). The bone mineral density of four sites (femoral neck, trochanter, intertrochanteric region, and Ward's triangle) was measured in the nonfractured femur using dual-energy x-ray absorptiometry. [Results] The young adult mean of the total proximal femur was significantly lower in Groups II and III than that in Group I by 13.8% and 20.8%, respectively. The young adult mean of the change rate of Ward's triangle was the highest in the four sites and significantly lower in Groups II and III than that in Group I by 24.3% and 31.6%, respectively. [Conclusion] The BMD decline in older women might be more pronounced in the anatomical regions with a higher trabecular bone proportions.