Biomechanical

Publications

Rectus Femoris and Vastus Intermedius Fiber Excursions Predicted by Three-Dimensional Muscle Models

This paper uses advanced finite-element modeling to build detailed 3D models of two quadriceps muscles, revealing highly variable internal stretching during knee flexion—variations missed by simpler models—improving simulation accuracy.

Three-Dimensional Representation of Complex Muscle Architectures and Geometries

Silvia S. Blemker, Scott L. Delp

This paper presents a method for building detailed 3D finite-element models of hip muscles, capturing fiber arrangement and functional differences. It shows that fibers within a single muscle can have widely varying moment arms, improving the accuracy of movement simulations.

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.