All Categories : Technical White Papers : CAE and FEA Bookmark and Share

Title : Advanced Material Modeling in a Virtual Biomechanical Knee
Company : SIMULIA
File Name : advanced-material-modeling-virtual-biomechanical-2008.pdf
Size : 144928
Type : application/pdf
Date : 09-Jul-2011
Downloads : 2

Rate This File
5 Stars
4 Stars
3 Stars
2 Stars
1 Star

For clinicians and medical device manufacturers, in-vitro and in-vivo testing of the knee are important methods for evaluating treatment techniques. However, numerical models that can provide much of the same information will become of more service and are a new focus of the modeling community. A continued effort has centered on specimen-specific anatomical and functional models, in terms of both geometry and mechanical properties of the tissue constituents. Here, a specimen-specific model of the knee is presented that includes the femur, tibia, and four main ligaments (ACL, PCL, MCL, and LCL). Solid models based on CT and MR scans of a human knee joint were meshed in Patran and assembled for solving in Abaqus 6.7-1. Ligaments were modeled using a nonlinear strain energy function which decouples the contributions of the nonlinear, isotropic ground substance (modeled as a neo-Hookean material) and the aligned, nonlinear collagen fibers (modeled using embedded one-dimensional nonlinear springs). Values of the material properties of the ACL were determined using inverse finite element (FE) analysis in which the other three ligaments were resected. Parameter regression was accomplished using the nonlinear local, gradient-based optimization capabilities of both Matlab (Mathworks, Natick, MA) and the optimization software HEEDS (Red Cedar Technology, East Lansing, MI). Analyses for regression assumed a displacement/rotation profile for the femur based on an experimental protocol in development, and optimized against the predicted reaction forces relative to the experimental measurements. Properties of the MCL, LCL, and PCL can be determined sequentially in a similar fashion, thus building up the full knee joint. The ability of the FE model to replicate joint kinematics will be presented, as well as the success of the nonlinear material parameter optimization.
User Reviews More Reviews Review This File
SolidCAM - Learn More

Editorial
Latest Blog Posts
Jobs
Ecommerce Account Manager for Bright Atlas LLC at Miami Gardens, Florida
Upcoming Events
CES - The Global Stage for Innovation at LAS VEGAS NV - Jan 7 - 10, 2020
AHR Expo at Orange County Convention Center West Building Orlando FL - Feb 3 - 5, 2020
Design & Manufacturing at Anaheim Convention Center Anaheim CA - Feb 11 - 13, 2020
METAV 2020 at Düsseldorf Germany - Mar 10 - 13, 2020
Kenesto: 30 day trial
SolidCAM:



Internet Business Systems © 2019 Internet Business Systems, Inc.
25 North 14th Steet, Suite 710, San Jose, CA 95112
+1 (408) 882-6554 — Contact Us, or visit our other sites:
AECCafe - Architectural Design and Engineering EDACafe - Electronic Design Automation GISCafe - Geographical Information Services TechJobsCafe - Technical Jobs and Resumes ShareCG - Share Computer Graphic (CG) Animation, 3D Art and 3D Models
  Privacy PolicyAdvertise