Osteoporos Sarcopenia.  2021 Dec;7(4):127-133. 10.1016/j.afos.2021.10.001.

Daily activity relates to not only femoral bone mineral density, but also hip structural analysis parameters: A cross-sectional observational study

• Fujii N
• Okimoto N
• Tsukamoto M
• Fujii N
• Asano K
• Ikejiri Y
• Yoshioka T
• Tajima T
• Yamanaka Y
• Zenke Y
• Kawasaki M
• Ozawa J
• Umehara T
• Takano S
• Murata H
• Kito N

• KMID: 2524621
• DOI: http://doi.org/10.1016/j.afos.2021.10.001

Abstract

Objectives
Physical activity to maintain bone mass and strength is important for hip fracture prevention. We aim to investigate the relationship between physical performance/activity status and bone mineral density (BMD)/hip structural analysis (HSA) parameters among postmenopausal women in Japan.
Methods
Sixty-two postmenopausal women diagnosed with osteoporosis (mean age: 72.61 ± 7.43 years) were enrolled in this cross-sectional observational study. They were evaluated for BMD and HSA in the proximal femur by dual-energy X-ray absorptiometry and underwent several physical performance tests, the Geriatric Locomotive Function Scale of 25 questions (GLFS-25). Principal component analysis (PCA) was used to summarize data on the BMD/HSA parameters. Partial correlation analysis, multiple regression analysis, and structural equation modeling (SEM) were performed to investigate the relationship between physical performance/activity status and BMD/HSA parameters of the proximal femur.
Results
In a partial correlation analysis adjusted for age and body mass index (BMI), GLFS-25 scores were correlated with HSA parameter (|r| = 0.260–0.396, P < 0.05). Principal component 1 (PC1) calculated by PCA was interpreted as more reflective of bone strength based on the value of BMD/HSA parameters. The SEM results showed that the model created by the 3 questions (Q13, brisk walking; Q15, keep walking without rest; Q20, load-bearing tasks and housework) of the GLFS-25 had the best fit and was associated with the PC1 score (β = −0.444, P = 0.001).
Conclusions
The GLFS-25 score was associated with the BMD/HSA parameter, which may reflect the bone strength of the proximal femur as calculated by PCA.

Keyword

Geriatric locomotive function scale of 25; questions; Hip structural analysis; Bone mineral density; Osteoporosis; Locomotive syndrome