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[[TableOfContents]] <<TableOfContents>>
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 * Ahmet Erdemir - study planning, outline of publications
 * Snehal Chokhandre - execution of simulations and post-processing, lead authorship in publications
 * Craig Bennetts - assisting simulations, scripting for pre-/post-processing, support to document model in publications
 * Tara Bonner - assiting pivot shift trajectory generation, support documentation on pivot shift literature and implications of simulations for robotics testing
 * Robb Colbrunn - lead pivot shift trajectory generation, provide literature survey on pivot shift studies (clinical and cadaver testing), support to document implications of simulations for robotics testing
 * Paul Saluan - support to document clinical utility of pivot shift and implications of simulations for clinical practice

Contents

  1. Synopsis
    1. Use Case
    2. Simulation Aims
    3. Model
    4. Inputs
    5. Outputs
    6. Simulation Conditions
  2. Team Members
  3. Progress
    1. Source Code Repository
    2. Data
    3. Model Customization
    4. Simulations
    5. Post-Processing
    6. Publications
  4. References

Synopsis

The overall goal of this case study is to provide the utility of Open Knee(s) - Generation 1 model for reproducing the outcome of a clinical test, the pivot shift, for evaluating mechanical function of the anterior cruciate ligament.

Use Case

The case is based on reproduction of a pivot shift loading scenario in a tibiofemoral joint model. The loading scenario was measured in a cadaver knee during pivot shift tests conducted by an orthopaedic surgeon. In follow-up robotics testing, this loading profile was adjusted for robotics testing of intact, ACL deficient, and ACL reconstructed knees. The use case aims for illustrating the capacity of the Open Knee(s) - Generation 1 model to reproduce the clinical differentiation of intact and ACL deficient knee in a virtual sense.

Simulation Aims

  • To understand the role of ACL for stabilization of the joint during pivot shift testing (primary)
  • To explore the correspondence of Open Knee(s) simulation against robotics prescribed pivot shift loading of various knees (secondary)

Model

The model is based on Open Knee(s) - Generation 1 model, which was updated for FEBio version 2.1:

Inputs

Prescribed time histories of movement and loading of the tibiofemoral joint (six degrees of freedom) representative of pivot shift data:

  • flexion
  • internal/external rotation torque
  • varus/valgus torque
  • anterior/posterior force
  • medial/lateral force
  • compression/distraction force

Outputs

  • Time histories of kinematics-kinetics of the tibiofemoral joint (six degrees of freedom) (primary)
    • flexion torque
    • internal/external rotation
    • varus/valgus
    • anterior/posterior translation
    • medial/lateral translation
    • compression/distraction
  • Time histories of stress-strain behavior (secondary)

Simulation Conditions

  • with intact ACL
  • without the ACL (very low stiffness for convenient modeling and simulation workflow)

Team Members

  • Ahmet Erdemir - study planning, outline of publications
  • Snehal Chokhandre - execution of simulations and post-processing, lead authorship in publications
  • Craig Bennetts - assisting simulations, scripting for pre-/post-processing, support to document model in publications
  • Tara Bonner - assiting pivot shift trajectory generation, support documentation on pivot shift literature and implications of simulations for robotics testing
  • Robb Colbrunn - lead pivot shift trajectory generation, provide literature survey on pivot shift studies (clinical and cadaver testing), support to document implications of simulations for robotics testing
  • Paul Saluan - support to document clinical utility of pivot shift and implications of simulations for clinical practice

Progress

Source Code Repository

https://simtk.org/svn/openknee/app/PivotShift/

Data

https://simtk.org/svn/openknee/app/PivotShift/dat/

Model Customization

https://simtk.org/svn/openknee/app/PivotShift/src/

Simulations

Post-Processing

https://simtk.org/svn/openknee/app/PivotShift/sol/

Publications

https://simtk.org/svn/openknee/app/PivotShift/doc/

References

Cases/PivotShift (last edited 2016-05-04 22:09:50 by localhost)