Nonlinear Finite Element Model Predicts Vertebral Bone Strength and Fracture Site

Abstract

In Brief Study Design. A study on computed tomography (CT)-based finite element (FE) method that predicts vertebral strength and fracture site using human cadaveric specimens. Objective. To evaluate the accuracy of the nonlinear FE method by comparing the predicted data with those of mechanical testing. Summary of Background Data. FE methods may predict vertebral strength and fracture site but the prediction has been difficult because of a complex geometry, elastoplasticity, and thin cortical shell of the vertebra. Methods. FE models of the 12 thoracolumbar vertebral specimens were constructed. Nonlinear FE analyses were performed, and the yield load, the fracture load, the sites where elements failed, and the distribution of minimum principal strain were evaluated. A quasi-static uniaxial compression test for the same specimens was conducted to verify these analyses. Results. The yield loads, fracture loads, minimum principal strains, and fracture sites of the FE prediction significantly correlated with those measured. Conclusions. Nonlinear FE model predicted vertebral strength and fracture site accurately. Nonlinear finite element analysis was evaluated by performing mechanical testing using human cadaveric specimens. Twelve thoracolumbar vertebrae were analyzed, and quasi-static uniaxial compression test was conducted to verify these analyses. Yield loads, fracture loads, minimum principal strains, and fracture sites of the finite element prediction significantly correlated with those measured.