Publications

Publications

Calcaneal Loading During Walking and Running

This paper uses a finite element model of the human foot, combined with force plate and high-speed x-ray data, to analyze calcaneus biomechanics during walking and running. The study found forces up to 11 times body weight on hindfoot joints late in stance. Predicted internal stress patterns closely matched actual bone structure, highlighting the link between mechanical loading and bone anatomy.

Automated Volumetric Grid Generation for Finite Element Modeling of Human Hand Joints

K. Hollerbach, K. Underhill, R. Rainsberger

This paper describes an automated method for creating the 3D computational grids, or meshes, necessary for the finite element analysis of human hand joints. By using a library of pre-defined templates that are automatically fitted to a patient's specific anatomy from MRI scans, the technique significantly reduces manual effort and improves the quality of the biomechanical models. This automation is a key step toward making patient-specific joint modeling a practical tool for physicians.

A Computational Method for Comparing the Behavior and Possible Failure of Prosthetic Implants

C. Nielsen, K. Hollerbach, S. Perfect, K. Underhil

This research uses finite element analysis to create computer models of three different prosthetic thumb joint implants to study their biomechanical performance. By simulating high-load conditions similar to a power pinch, the study identifies areas of high contact stress on the plastic components that could lead to wear and failure. This computational method allows for the comparison of implant designs to better understand potential failure modes before they are used in patients.

Three-dimensional Finite Element Modeling of Ligaments: Technical Aspects

This paper serves as a detailed technical guide to the process of creating and validating three-dimensional finite element models of human ligaments. It covers the entire biomechanical modeling pipeline, from obtaining geometry via medical imaging to applying advanced constitutive models that capture the tissue's complex properties. A key focus is a novel method for incorporating the ligament's natural pre-tension (in situ strain) into the models which is critical for achieving accurate results.

Effect of High +gz Accelerations on the Left Ventricle

K. Behdinan, B. Tabarrok, W.D. Fraser

This study uses a detailed FE< to simulate the biomechanical effects of high G-forces, like those experienced by fighter pilots, on the human heart's left ventricle. The analysis reveals that these accelerations cause the ventricle to stretch significantly and produce high, non-uniform stress patterns, particularly at the top of the heart near its attachments. This computational approach helps to understand the potential for mechanical tissue damage under extreme aerospace conditions.