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Material properties of interstitial lamellae reflect local strain environments
Author(s) -
Goodwin Kelly J.,
Sharkey Neil A.
Publication year - 2002
Publication title -
journal of orthopaedic research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.041
H-Index - 155
eISSN - 1554-527X
pISSN - 0736-0266
DOI - 10.1016/s0736-0266(01)00152-8
Subject(s) - materials science , strain (injury) , composite material , elastic modulus , ultimate tensile strength , tibia , modulus , anatomy , medicine
The objective of this study was to determine if the material properties of bone at the lamellar level are related to the predominant mode and magnitude of mechanical strain experienced in situ. The tibia and first metatarsal bones of five unpaired cadaveric lower extremities were instrumented with strain gauge rosettes and subjected to repeated loading trials in an apparatus that replicates the muscle forces and external loads experienced by the foot and shank while walking. The spatial distributions of axial strain within diaphyseal cross‐sections taken from each bone were subsequently determined. Nanoindentation measurements were then performed on the same cross‐sections to determine the compressive elastic moduli of individual lamellae located within osteonal, interstitial, and outer circumferential microstructures. Twenty percent of the variance in interstitial elastic modulus within cross‐sections of diaphyseal bone was explained by local strain magnitude. Lamellae residing in regions of compressive strain displayed significantly higher compressive elastic modulus values than those located in predominantly tensile regions (19.9 ± 1.6 GPa compared to 17.9 ± 1.7 GPa, p < 0.05). Elastic moduli of interstitial lamellae were 11% greater than those of osteonal or outer circumferential lamellae, irrespective of strain or anatomical location ( p < 0.001). Differences exist in the material properties of individual bone lamellae located within different anatomical regions and different microstructures, and these differences are related to the distribution of axial strain. These findings suggest that mechanical strain, or another closely related variable, may influence the design and ultimate mechanical behavior of the extra‐cellular matrix found in lamellar bone. This tissue heterogeneity is of potential importance in bone fragility and adaptation. © 2002 Orthopaedic Research Society. Published by Elsevier Science Ltd. All rights reserved.