TableOfContents

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

Inputs

Outputs

Simulation Conditions

Six degrees of freedom loading of tibiofemoral joint (prescribed flexion; internal/external rotation and varus/valgus moments; anterior/posterior, medial/lateral and compression/distraction forces):

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

Team Members

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