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Insights into the effects of tensile and compressive loadings on human femur bone.

Havaldar R, Pilli SC, Putti BB - Adv Biomed Res (2014)

Bottom Line: The results show that stress induced in the bone tissue depends on age and gender.It is observed that both tensile and compression strengths reduces as age advances.Mechanical properties of bone are age and gender dependent.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Karnataka Lingayat Education Society's College of Engineering and Technology, Belgaum, India.

ABSTRACT

Background: Fragile fractures are most likely manifestations of fatigue damage that develop under repetitive loading conditions. Numerous microcracks disperse throughout the bone with the tensile and compressive loads. In this study, tensile and compressive load tests are performed on specimens of both the genders within 19 to 83 years of age and the failure strength is estimated.

Materials and methods: Fifty five human femur cortical samples are tested. They are divided into various age groups ranging from 19-83 years. Mechanical tests are performed on an Instron 3366 universal testing machine, according to American Society for Testing and Materials International (ASTM) standards.

Results: The results show that stress induced in the bone tissue depends on age and gender. It is observed that both tensile and compression strengths reduces as age advances. Compressive strength is more than tensile strength in both the genders.

Conclusion: The compression and tensile strength of human femur cortical bone is estimated for both male and female subjecting in the age group of 19-83 years. The fracture toughness increases till 35 years in male and 30 years in female and reduces there after. Mechanical properties of bone are age and gender dependent.

No MeSH data available.


Related in: MedlinePlus

Tensile strength vs age for the femur cortical bone
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Figure 3: Tensile strength vs age for the femur cortical bone

Mentions: Figure 3 show the tensile load behaviour with respect to age for male and females. It is observed that tensile strength reduces as age advances, male show higher bone strength than female. Curve fit is obtained of second degree polynomial expression y = −0.0037x2 −0.0138x+41.808 and trend line is obtained with R2 value for male trend line being 0.939 and that y = −0.0002x2 −0.1819x+49.801 for female R2 value is 0.739, hence in the given range of age from 19 to 83 years one can find out corresponding tensile strengths. Figure 4 shows the compressive load behaviour with respect to age for male and females. It is observed that compressive strengths reduce as age advances, male show higher bone strength than female in compression testing also. Curve fit is obtained of second degree polynomial expression y = −0.001x2 −0.8158x+163.93 and trend line is obtained with R2 value for male trend line being 0.966 and that for female y = 0.0005x2 −0.795x+181.72 with R2 value as 0. 942, hence in the given range of age from 19 to 83 years one can find out corresponding compressive strengths. Variation in Young's modulus with age for human femur cortical bone of male and female is shown in Figure 5, curve fit is obtained is of second degree polynomial expression y = 0.5083x2 −38.204x+836.71 with R2 value 0.888 for male. It is observed that it is almost constant till the age of 55 years, a small increase is found in the age 55 to 75 years and a significant increase after the age of 75 years and above. This clearly indicates that in males bone is elastic till the age of 55 years which is due to the compactness in the bone tissue organisation and in older ages pores induces into the bone tissue, and decrease in the density and bone turns it to be brittle. In female, till the age of 55 years there is no considerable variation is observed. It is noted that a significant increase after the age of 55 years and above. Curve fit is obtained of second degree polynomial expression y = 0.2552x2 −20.282x+593.8 with R2 value 0.709. This clearly indicates that bone is turning towards brittle after 55 years of age in females.


Insights into the effects of tensile and compressive loadings on human femur bone.

Havaldar R, Pilli SC, Putti BB - Adv Biomed Res (2014)

Tensile strength vs age for the femur cortical bone
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4007336&req=5

Figure 3: Tensile strength vs age for the femur cortical bone
Mentions: Figure 3 show the tensile load behaviour with respect to age for male and females. It is observed that tensile strength reduces as age advances, male show higher bone strength than female. Curve fit is obtained of second degree polynomial expression y = −0.0037x2 −0.0138x+41.808 and trend line is obtained with R2 value for male trend line being 0.939 and that y = −0.0002x2 −0.1819x+49.801 for female R2 value is 0.739, hence in the given range of age from 19 to 83 years one can find out corresponding tensile strengths. Figure 4 shows the compressive load behaviour with respect to age for male and females. It is observed that compressive strengths reduce as age advances, male show higher bone strength than female in compression testing also. Curve fit is obtained of second degree polynomial expression y = −0.001x2 −0.8158x+163.93 and trend line is obtained with R2 value for male trend line being 0.966 and that for female y = 0.0005x2 −0.795x+181.72 with R2 value as 0. 942, hence in the given range of age from 19 to 83 years one can find out corresponding compressive strengths. Variation in Young's modulus with age for human femur cortical bone of male and female is shown in Figure 5, curve fit is obtained is of second degree polynomial expression y = 0.5083x2 −38.204x+836.71 with R2 value 0.888 for male. It is observed that it is almost constant till the age of 55 years, a small increase is found in the age 55 to 75 years and a significant increase after the age of 75 years and above. This clearly indicates that in males bone is elastic till the age of 55 years which is due to the compactness in the bone tissue organisation and in older ages pores induces into the bone tissue, and decrease in the density and bone turns it to be brittle. In female, till the age of 55 years there is no considerable variation is observed. It is noted that a significant increase after the age of 55 years and above. Curve fit is obtained of second degree polynomial expression y = 0.2552x2 −20.282x+593.8 with R2 value 0.709. This clearly indicates that bone is turning towards brittle after 55 years of age in females.

Bottom Line: The results show that stress induced in the bone tissue depends on age and gender.It is observed that both tensile and compression strengths reduces as age advances.Mechanical properties of bone are age and gender dependent.

View Article: PubMed Central - PubMed

Affiliation: Department of Biomedical Engineering, Karnataka Lingayat Education Society's College of Engineering and Technology, Belgaum, India.

ABSTRACT

Background: Fragile fractures are most likely manifestations of fatigue damage that develop under repetitive loading conditions. Numerous microcracks disperse throughout the bone with the tensile and compressive loads. In this study, tensile and compressive load tests are performed on specimens of both the genders within 19 to 83 years of age and the failure strength is estimated.

Materials and methods: Fifty five human femur cortical samples are tested. They are divided into various age groups ranging from 19-83 years. Mechanical tests are performed on an Instron 3366 universal testing machine, according to American Society for Testing and Materials International (ASTM) standards.

Results: The results show that stress induced in the bone tissue depends on age and gender. It is observed that both tensile and compression strengths reduces as age advances. Compressive strength is more than tensile strength in both the genders.

Conclusion: The compression and tensile strength of human femur cortical bone is estimated for both male and female subjecting in the age group of 19-83 years. The fracture toughness increases till 35 years in male and 30 years in female and reduces there after. Mechanical properties of bone are age and gender dependent.

No MeSH data available.


Related in: MedlinePlus