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KMID : 1007020090070020084
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Korean Soceity of Osteroporosis
2009 Volume.7 No. 2 p.84 ~ p.95
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Correlation of the Microstructural and Mechanical Strength of the Trabecular Bone - The Primary Compression Trabeculae in Human Femoral Head -
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Baek Myong-Hyun
Won Ye-Yeon
Cui Wen-Quan
Kim Yeong-Eun
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Abstract
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Objectives: Bone mechanical strength is one of the factors to assess for bone fracture risk. Many researchers try to predict the fracture risk by using morphometry indices, experimental test (Instron) and a finite element analysis (FEA). The purpose of this study was to evaluate the correlation between the microstructural property and mechanical strength in the primary compression trabeculae in the human femoral head.
Methods: Twenty-one human femoral heads were obtained from 11 patients undergoing a total hip replacement and 10 cadavers. Cylindrical trabecular bone samples were cored from the primary compressive trabecular pattern in the femoral head. The sample size has diameter of 19 mm and a height of 15 mm. All samples were scanned with a micro-CT at a spatial resolution of 21.31μm. Based on the serial micro-images, the structural properties were directly calculated from ANT software. The mechanical strength was calculated for the experimental test and the FEA.
Results: The average yield stress and elastic modulus from the FEA and the Instron system were 13.58 ㎫ and 266.81 ㎫, 13.17 ㎫ and 288.51 ㎫, respectively. Pearson correlations between the morphometry indices, Tb.Sp, BV, BS/BV, BV/TV, MIL and Tb.N were significantly correlated with the mechanical strength.
Conclusion: This result indicates that significant correlation the mechanical strength and structural properties can be a useful tool to predict the bone mechanical strength.
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KEYWORD
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Bone strength, Microstructural property, Mechanical strength, Finite Element Analysis, Micro-CT
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