Authors:

Brian Arild Kelly

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About Paper:

Bone fracture risks increase with age because of bone degradation. Bone mineral density (BMD) is a common metric used to evaluate bone health, but it fails to account for bone geometry variation. The use of BMD alone can result in misjudgment of actual bone stiffness and strength. A potential alternative to the sole use of BMD to assess bone biomechanical properties is the use of bone finite element method. With the finite element method, solutions to elasticity in a solid body (such as a whole bone) are obtained by discretion into element assemblies and a weak form matrix solution. The whole bone model can be placed under realistic boundary conditions to simulate stress and strain distributions, accounting for both material and geometric properties. To validate the whole bone finite element models, simulation data was compared with experiments on 3d printed bone surrogates. Twelve cadaveric radius bones were obtained from donors. High Resolution peripheral Quantitative Computerized Tomography (HR-pQCT) scans were obtained. Images were used to measure BMD values and bones were ranked in terms of BMD. Finite element models were created from the image scans and 3-point bending experiments were simulated. Each of the bones were 3D printed and subjected to 3-point bending. The bones were then ranked in terms of yield load. BMD ranking is then compared to yield load ranking. We hypothesize that there exists a significant difference in BMD and predicted yield load rankings. Keywords: Finite Element Analysis; Radius Bone; CT-Scan; Bone Mineral Density; 3-Point Bending

Source:

Purdue University / 2025

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Co-authors:

Brian Arild Kelly