Fracture toughness is dependent on bone location--a study of the femoral neck, femoral shaft, and the tibial shaft.

The fracture toughness of the right femoral neck, femoral shaft, and tibial shaft of matched cadaveric bones, ages 50 to 90 years, was compared. Results of this study indicate that tensile (G(Ic)) and shear (G(IIc)) fracture toughness vary depending on bone location. The femoral neck has the greatest resistance to crack initiation for both tension and shear loading while the femoral shaft has the least. The relationship between age and the fracture toughness of the femoral neck and shaft was investigated. G(c) of the femoral shaft significantly decreased with age for mode I and was nearly significant for mode II. Fracture toughness of the femoral neck did not change with age for the later decades of life. Implications of these findings are discussed.

[1]  P. Marcal,et al.  Small scale yielding near a crack in plane strain: A finite element analysis , 1971 .

[2]  D T Davy,et al.  Anisotropic yield behavior of bone under combined axial force and torque. , 1985, Journal of biomechanics.

[3]  D Vashishth,et al.  Crack growth resistance in cortical bone: concept of microcrack toughening. , 1997, Journal of biomechanics.

[4]  J. Tukey Comparing individual means in the analysis of variance. , 1949, Biometrics.

[5]  T. M. Boyce,et al.  Cortical aging differences and fracture implications for the human femoral neck. , 1993, Bone.

[6]  F. G. Evans,et al.  Strength of biological materials , 1970 .

[7]  W C Hayes,et al.  Age-related reductions in the strength of the femur tested in a fall-loading configuration. , 1995, The Journal of bone and joint surgery. American volume.

[8]  W C Hayes,et al.  Fracture mechanics parameters for compact bone--effects of density and specimen thickness. , 1977, Journal of biomechanics.

[9]  W. Bonfield,et al.  Crack velocity dependence of longitudinal fracture in bone , 1980 .

[10]  W. Bonfield,et al.  Orientation dependence of the fracture mechanics of cortical bone. , 1989, Journal of biomechanics.

[11]  Melick Ra,et al.  Variations of tensile strength of human cortical bone with age. , 1966 .

[12]  Y. Yeni,et al.  Influence of microdamage on fracture toughness of the human femur and tibia. , 1998, Bone.

[13]  J L Kelsey,et al.  Epidemiology of osteoporosis and osteoporotic fractures. , 1985, Epidemiologic reviews.

[14]  F. G. Evans,et al.  Relations between the microscopic structure and tensile strength of human bone. , 1958, Acta anatomica.

[15]  P Zioupos,et al.  Changes in the stiffness, strength, and toughness of human cortical bone with age. , 1998, Bone.

[16]  R. Young,et al.  Crack velocity and the fracture of bone. , 1978, Journal of biomechanics.

[17]  O Lindahl,et al.  Cortical bone in man. II. Variation in tensile strength with age and sex. , 1967, Acta orthopaedica Scandinavica.

[18]  F. G. Evans,et al.  Differences and relationships between the physical properties and the microscopic structure of human femoral, tibial and fibular cortical bone , 1967 .

[19]  Y. Yeni,et al.  The influence of bone morphology on fracture toughness of the human femur and tibia. , 1997, Bone.

[20]  E Y Chao,et al.  Internal forces and moments in the femur during walking. , 1997, Journal of biomechanics.

[21]  U Helfenstein,et al.  Elastic properties of cortical bone in female human femurs. , 1976, Journal of biomechanics.

[22]  F. G. Evans,et al.  Mechanical properties and histology of cortical bone from younger and older men , 1976, The Anatomical Record.

[23]  D B Burr,et al.  Resistance to crack growth in human cortical bone is greater in shear than in tension. , 1996, Journal of biomechanics.

[24]  Y. Yeni,et al.  Influence of bone composition and apparent density on fracture toughness of the human femur and tibia. , 1998, Bone.

[25]  J A McGeough,et al.  Age-related changes in the tensile properties of cortical bone. The relative importance of changes in porosity, mineralization, and microstructure. , 1993, The Journal of bone and joint surgery. American volume.

[26]  W. Bradley Understanding the Translation of Neat Resin Toughness into Delamination Toughness in Composites , 1991 .

[27]  W. Bonfield,et al.  Fracture mechanics of bone--the effects of density, specimen thickness and crack velocity on longitudinal fracture. , 1984, Journal of biomechanics.

[28]  M Martens,et al.  Aging of bone tissue: mechanical properties. , 1976, The Journal of bone and joint surgery. American volume.

[29]  D Vashishth,et al.  Fracture toughness of human bone under tension. , 1995, Journal of biomechanics.