Material properties of interstitial lamellae reflect local strain environments

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