| Budget Amount *help |
¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1995: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1994: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Research Abstract |
The pilaster is the enlarged linea aspera, or the posteriorly pronounced bony column of the human femur. This feature is frequently observed in the bones of the Jomon period, the Japan's neolithic period, several thousands years ago. The analysis of its etiology remains intact for a long time. The purpose of this study was to analyze mechanical function of the pilaster. A total of 128 Jomon femora and 119 recently macerated human femora were CT-scanned at the mid-shaft. The image data were examined in terms of density, thickness, and diameter in the cross-section. Averaged density and averaged thickness were calculated for each of eight directions (M,L,A,P,AM,AL,PM,PL), defined as to the direction of pilaster. Four indices including coefficient of variation of bone density (CV), bone density index (DE), bone thickness index (TH), section index (DI) were defined. The latter three indices were the rates of AP versus ML direction. The four indices showed the generally similar interrelationship between Jomon and recent femora, which supported an adaptation to bending. In addition, a close comparison of the mean indices and that of the interrelation of the four indices between the femora from the two periods suggested the mechanical contribution of the pilaster.
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