2006 Fiscal Year Final Research Report Summary
Research on evaluation of bone strength using a natural frequency and biomechanical characteristics of forearm
| Project/Area Number |
16500343
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Rehabilitation science/Welfare engineering
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| Research Institution | Kobe University |
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Principal Investigator |
YANO Sumio Kobe University, Faculty of Human Development, Professor, 発達科学部, 教授 (20115306)
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| Co-Investigator(Kenkyū-buntansha) |
FUKUDA Hiroya Kobe University, Faculty of Human Development, Associate Professor, 発達科学部, 助教授 (90294256)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Strength of bone / Biomechanical characteristic / Forearm / Natural frequency |
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| Research Abstract |
Concerning evaluating the strength and quality of human bones, we proposed some indexes by the measurement of natural frequencies of forearms and bone mineral densities and then investigated these aging characteristics for female over age 50. Bone mineral densities were measured by pQCT method at both 4% and 20% distal sites of radii and the CT images were analyzed. Results of the present research were as follows:
1. Aging characteristics of total bone density and cortical density at the 20% distal site were compared with those of bone densities at the 4% distal site. It was found that the ratio of total bone density at the 20% site to that at the 4% site was about twice for any age group and the decrease rate of cortical density at the 20% site was smaller than that of total bone densities.
2. Concerning the influence of muscles on bones, the sectional areas of muscles and bones were analyzed from CT images at the 20% site. A method for obtaining the muscle area without fat regions was proposed and the ratio of bone areas to muscle areas (B/M ratio) was used as an index for this purpose.
3. For subjects with the measurement of natural frequencies bone strength indexes of three kinds corresponding to the Young's modulus were calculated and these aging characteristics were investigated. The bone strength index using the total bone density at the 4% site is considered to be most available. The decrease rate of the bone strength index for aging is more remarkable than that of bone mineral densities and B/M ratio. It is found that bone mineral densities and the bone area decrease earlier than bone strength indexes and the muscle area.
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