Mechanical properties of metaphyseal bone in the proximal femur

Lotz, Jeffrey C.; Gerhart, Tobin N.; Hayes, Wilson C.

doi:10.1016/0021-9290(91)90350-v

Cited by 171 publications

(117 citation statements)

References 8 publications

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“…The final OPB configuration utilized a cortex shell material identical to that used in commercially available 3 rd generation composite bone surrogates (Pacific Research Laboratories, Inc., Vashon, WA) ( Figure 1a). This material has a tensile modulus of 12.4 GPa and a tensile strength of 90 MPa (Cristofolini et al, 1996;Heiner and Brown, 2001) which correspond to those reported for human cortical bone (Bayraktar et al, 2004;Burstein et al, 1976;Lotz et al, 1991;McCalden et al, 1993;Reilly et al, 1974). The cortex shell was 160 mm long, had a 27 mm outer diameter and a shell thickness of 2 mm (Figure 1b).…”

Section: Osteoporotic Surrogatesupporting

confidence: 77%

A surrogate long-bone model with osteoporotic material properties for biomechanical testing of fracture implants

Sommers

Fitzpatrick²,

Madey

et al. 2007

Journal of Biomechanics

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In vitro comparative testing of fracture fixation implants is limited by the highly variable material properties of cadaveric bone. Bone surrogate specimens are often employed to avoid this confounding variable. Although validated surrogate models of normal bone exist, no validated bone model simulating weak, osteoporotic bone is available. This study presents an osteoporotic long-bone model designed to match the lower cumulative range of mechanical properties found in large series of cadaveric femora reported in the literature. Five key structural properties were identified from the literature: torsional rigidity and strength, bending rigidity and strength, and screw pull-out strength. An osteoporotic bone surrogate was designed to meet the low range for each of these parameters, and was mechanically tested. For comparison, the same parameters were determined for surrogates of normal bone. The osteoporotic bone surrogate had a torsional rigidity and torsional strength within the lower 2% and 16%, respectively, of the literature based cumulative range reported for cadaveric femurs. Its bending rigidity and bending strength was within the lower 11% and 8% of the literature based range, respectively. Its pull-out strength was within the lower 2% to16% of the literature based range. With all five structural properties being within the lower 16% of the cumulative range reported for native femurs, the osteoporotic bone surrogate reflected the diminished structural properties seen in osteoporotic femora. In comparison, surrogates of normal bone demonstrated structural properties within 23%-118% of the literature based range. These results support the need and utility of the osteoporotic bone surrogate for comparative testing of implants for fixation of femoral shaft fractures in osteoporotic bone.

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Section: Osteoporotic Surrogatesupporting

confidence: 77%

A surrogate long-bone model with osteoporotic material properties for biomechanical testing of fracture implants

Sommers

Fitzpatrick²,

Madey

et al. 2007

Journal of Biomechanics

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“…Dechow et al 94 conducted an investigation into the use of bone plates on the mandible in four adult rhesus monkeys. At the beginning and end of the experiments, bone strain was recorded inferior to each bone plate during evoked maximal incisal clenching.…”

Section: '[Insert Figure 8 About Here]'mentioning

confidence: 99%

Application of the finite element method in dental implant research

Staden

Guan

Loo

2006

Computer Methods in Biomechanics and Biomedical Engineering

217

139

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This article provides a review of the achievements and advancements in dental technology brought about by computer-aided design and the all powerful finite element method of analysis. The scope of the review covers dental implants, jawbone surrounding the implant and the biomechanical implant and jawbone interaction. Prevailing assumptions made in the published finite element analysis, and their limitations are discussed in some detail which helps identify the gaps in research as well as future research direction.

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“…For inhomogeneous material properties, the elastic modulus is typically estimated using empirical equations that relate the bone density to modulus. Such empirical densityelasticity relationships have been identified for the human femur (102,(181)(182)(183)(184)(185), tibia (102,117,(186)(187)(188), pelvis (189), and vertebrae (102,183,(190)(191)(192). The empirical equations have been found to be site-specific (102), and equations for cortical bone are different from equations for trabecular bone within the same gross anatomical location (193).…”

Section: The Finite Element Methodsmentioning

confidence: 99%

Experimental validation of finite element predicted bone strain in the human metatarsal

Fung

Loundagin

Edwards

2017

Journal of Biomechanics

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The objective of this study was to verify and validate a finite element modeling routine for the human metatarsal, which is a common location for stress fractures. Experimental strain measurements on 33 human cadaveric metatarsals subject to cantilever bending were compared with strain predictions from finite element (FE) models generated from computed tomography images. For the material property assignment of the FE models, a published density-elasticity relationship was compared with density-elasticity equations developed using optimization techniques. The correlations between the measured and predicted and predicted strains were very high (r 2 ≥0.94) for all of the density-elasticity equations. However, the utilization of an optimized density-elasticity equation improved the accuracy of the finite element models, reducing the maximum error between measured and predicted strains by 10% to 20%. The finite element modeling routine could be used for investigating potential interventions to minimize metatarsal strains and the occurrence of metatarsal stress fractures.iii

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Mechanical properties of metaphyseal bone in the proximal femur

Cited by 171 publications

References 8 publications

A surrogate long-bone model with osteoporotic material properties for biomechanical testing of fracture implants

A surrogate long-bone model with osteoporotic material properties for biomechanical testing of fracture implants

Application of the finite element method in dental implant research

Experimental validation of finite element predicted bone strain in the human metatarsal

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