Stiffening Effects of Cortical Bone on Vertebral Cancellous Bone In Situ

Bryce, R; Aspden, Richard M.; Wytch, R.

doi:10.1097/00007632-199505000-00004

Cited by 21 publications

(12 citation statements)

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“…These results are in agreement with Bryce et al [3] who demonstrated with mechanical testing that the stiffening effect of the cortical shell increased as the isolated stiffness of the cancellous bone decreased. For the vertebral-shaped specimens, the combined effect of the shell thickness and the strut spacing was not found.…”

Section: Discussionsupporting

confidence: 93%

“…The presence of an outer wall (cortical shell) constrains the inner structured material (trabecular bone) limiting its lateral expansion; and therefore, the outer wall significantly affects the apparent elastic modulus of the specimen. These results are in agreement with Bryce et al [3] who demonstrated with biomechanical testing that the combined structure of cortical and cancellous bone in the vertebral body increases the stiffness and strength considerably from what would be expected for the isolated tissue alone (181 vs. 44 MPa).…”

Section: Discussionsupporting

confidence: 93%

“…where q CT is the mineral density in g/cm 3 and HU X-ray attenuation in terms of Hounsfield units. Images were analysed using a commercially available semi-automated segmentation and three-dimensional (3D) reconstruction software (SliceOmatic v4.3, Tomovision Inc, Montréal, QC, Canada) in order to identify the regions of interest (ROI).…”

Section: Specimen Apparent Densitymentioning

confidence: 99%

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Comparison of the influences of structural characteristics on bulk mechanical behaviour: experimental study using a bone surrogate

Levasseur

Ploeg

Petit

2011

Med Biol Eng Comput

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An experimental study was conducted to classify the influence of trabecular architecture and cortical shell thickness on the mechanical properties using a bone surrogate. Thirty-six rectangular prisms and 18 vertebral-shaped specimens were fabricated with fused deposition modelling (FDM) as a bone surrogate with controlled structural characteristics (cortical wall thickness, strut spacing, strut angle and strut orientation). The apparent density of the FDM specimens was evaluated using quantitative computed tomography (QCT) imaging and related to the apparent elastic modulus measured with compression testing. The effects of the structural parameters on the apparent elastic modulus were analysed using analysis of variance (ANOVA). The results obtained corroborate that the structural parameters have a significant effect on the apparent mechanical properties of the bulk material. The cortical shell thickness was found to have more influence than trabecular architecture. Therefore, accurate modelling of the cortical shell thickness should be considered more important than trabecular architecture in development of bone finite element models and bone surrogates.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Section: Specimen Apparent Densitymentioning

confidence: 99%

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Comparison of the influences of structural characteristics on bulk mechanical behaviour: experimental study using a bone surrogate

Levasseur

Ploeg

Petit

2011

Med Biol Eng Comput

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“…Secondly, the discongruency between the cylindrical shape of the cage and the wedge-shaped intervertebral disc space in the sagittal plane could result in destruction of the posterior part of the L5 endplate. If so, the posterior part of the cage, which is supposed to resist a considerable amount of compressive force, will rest on the softer cancellous vertebral body bone [2,6,16]. The decrease of posterior intervertebral disc height during this time is a result of the subsidence of the cage into the posterior part of the vertebral body.…”

Section: Discussionmentioning

confidence: 99%

Anterior lumbar interbody fusion with threaded fusion cages and autologous bone grafts

Pavlov¹,

Spruit²,

Havinga

et al. 2000

European Spine Journal

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“…The strength of bone material is a complicated function of its composition and organization, which is still poorly understood. In addition, its incorporation into a complex structure such as the proximal femur or a vertebra, can markedly affect its properties [2,3], appearing stiffer and stronger than when tested in isolation. Bone in the femoral neck assumes two structural forms, trabecular and cortical, which occupy different fractions of the volume of the neck on passing distally from the femoral head to the intertrochanteric region.…”

Section: Introductionmentioning

confidence: 99%

Material Properties of Bone from the Femoral Neck and Calcar Femorale of Patients with Osteoporosis or Osteoarthritis

Aspden

1997

Osteoporosis International

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Patients with osteoarthritis (OA) rarely fracture the neck of the femur whereas this is common in patients with osteoporosis (OP). The reasons for this are not clear. In this study, cores of trabecular bone and thin slices of bone from the calcar were obtained from the femoral neck of patients with OA or OP following hip arthroplasty and a normal group post mortem. The mechanical properties, densities and material composition were measured. The aim was to determine whether differences in these properties could explain why osteoarthritic patients did not suffer from fractured neck of femur. No difference was found in the density or stiffness of the calcar between the groups, though there appeared to be a small increase in mineralization in the OA bone compared with the OP. However, there was a 72% increase in the volume of trabecular bone in the OA group compared with a loss of about 20% in the OP group. This increased apparent density of the OA trabecular bone resulted in a greater stiffness, yield strength and energy absorbed to yield, whereas the same properties of OP bone were not significantly lower than normal. These marked changes in the OA bone could result in a redistribution of stresses due to loads caused by falling, thereby absorbing the energy of impact and preventing the formation of a fracture surface.

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Stiffening Effects of Cortical Bone on Vertebral Cancellous Bone In Situ

Cited by 21 publications

References 0 publications

Comparison of the influences of structural characteristics on bulk mechanical behaviour: experimental study using a bone surrogate

Comparison of the influences of structural characteristics on bulk mechanical behaviour: experimental study using a bone surrogate

Anterior lumbar interbody fusion with threaded fusion cages and autologous bone grafts

Material Properties of Bone from the Femoral Neck and Calcar Femorale of Patients with Osteoporosis or Osteoarthritis

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