Test on compressive properties of trabecular bone in proximal femur using digital image correlation technique / 医用生物力学

ABSTRACT

Objective To improve the method used for traditional compression test to reflect the compressive elastic modulus of trabecular bone in proximal femur more accurately and investigate its biomechanical properties to provide experimental evidences for clinical treatment. Methods The properties of trabecular bone from normal cadaveric proximal femur(45~60 years old) were measured by the micro material mechanics testing system. Results The elastic modulus in the direction of principle compression and principle tension on trabecular bone were (335.26±183.85) MPa and (59.27±23.88) MPa, respectively. The biomechanical properties of trabecular bone in the direction of principle compression were significantly higher than those in its vertical direction.The displacement and strain distribution profiles under the loading were recorded, which showed to be asymmetric. Conclusions It is feasible to test the biomechanical properties of trabecular bone more accurately by the micro material mechanics testing system. The compressive properties of trabecular bone in proximal femur are obviously anisotropic and heterogeneous.