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Bone loss in Great Britain and Japan: a comparative longitudinal study
E Dennison1, N Yoshimura, T Hashimoto
1The MRC Environmental Epidemiology Unit, University of Southampton, Southampton General Hospital, UK.
Bone
|October 8, 1998
Summary
Japanese elderly individuals experience slower bone loss rates compared to their British counterparts, contributing to lower hip fracture incidence. This study highlights differences in bone density and loss patterns between populations.
Area of Science:
- Gerontology
- Epidemiology
- Bone Metabolism
Background:
- Hip fracture incidence varies globally, with lower rates observed in Japan compared to Western countries.
- Existing research points to differences in peak bone mass and hip geometry, but these do not fully account for the disparity in fracture rates.
- Involutional bone loss rate is a potential, underexplored factor influencing hip fracture risk.
Purpose of the Study:
- To prospectively compare the rates of age-related bone loss between elderly populations in Britain and Japan.
- To investigate whether differences in bone loss contribute to the observed variations in hip fracture incidence.
Main Methods:
- A prospective epidemiological study involving two population-based cohorts: 172 men and 143 women in Hertfordshire, UK, and 86 men and 90 women in Taiji, Japan.
- Annual bone loss rates were measured, and lifestyle factors (smoking, alcohol consumption, physical activity) were assessed via questionnaire.
- Baseline bone mineral density (BMD) at the lumbar spine, femoral neck, and trochanter was compared between the British and Japanese cohorts.
Main Results:
- Japanese participants had lower baseline BMD at the lumbar spine and trochanter compared to British participants. Significant differences were also noted at the femoral neck in men.
- While men in both populations showed bone gain at the lumbar spine, women exhibited greater bone loss rates in the British cohort compared to the Japanese cohort.
- These differences in bone loss rates, particularly at the femoral neck and trochanter in women, remained statistically significant after adjusting for age.
Conclusions:
- Elderly Japanese individuals appear to have lower peak bone mass but also exhibit slower rates of bone loss in later life than their European counterparts.
- The observed slower bone loss rates in the Japanese population provide a significant explanation for their relatively lower hip fracture incidence.
- Understanding population-specific bone loss dynamics is crucial for targeted osteoporosis prevention strategies.