Abstract
Background
This study aimed to clarify sex differences in the relationship between trunk muscle
mass, aging, and whole-body sagittal alignment.
Methods
Subjects aged 60–89 years who underwent musculoskeletal screening in 2018 were included
in the study. Subject demographics, trunk muscle mass (TMM) measured by bioelectrical
impedance analysis (BIA), and spinopelvic and lower extremity alignment parameters
measured from standing radiographic images were investigated. Additionally, TMM was
corrected for BMI (TMM/BMI). The relationship between trunk muscle and whole-body
sagittal alignment was analyzed for each age group (young-old group (60–74 years)
and old–old group (>75 years)) and sex.
Results
A total of 281 (mean age 75.4 ± 6.7 years, 100 males and 181 females) were enrolled.
The trunk muscle mass in both men and women significantly decreased with age. Regarding
TMM/BMI, there was no significant difference in men, but there was a significant difference
between females in the young-old and old–old groups (p < 0.001). TMM/BMI was significantly
correlated with sagittal vertical axis (SVA) and knee flexion angle (KF) in both sexes.
In females, TMM/BMI was significantly correlated with thoracic kyphosis in the young-old
group, whereas in the old–old group, TMM/BMI was correlated with SVA, PI-LL, and KF.
Conclusions
TMM was related to trunk anteverion and lower extremity alignment in both sexes. However,
the relationship between TMM on alignment differs between sexes. Thoracic hyperkyphosis
in young-old adults indicated a decrease in muscle mass, which may be a sign of future
malalignment.
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Article info
Publication history
Published online: January 07, 2022
Accepted:
November 25,
2021
Received in revised form:
October 30,
2021
Received:
July 10,
2021
Footnotes
☆Study design: cross-sectional cohort study.
Identification
Copyright
© 2021 The Japanese Orthopaedic Association. Published by Elsevier B.V. All rights reserved.
