Biweekly Meeting of Cleveland Clinic Core Team
Date: May 29, 2018
Time: 12:00 PM EST
Means: In person meeting
- Ahmet Erdemir
- Snehal Chokhandre
- Erica Neumann
- Ariel Schwartz
- Discuss Open Knee(s) progress.
- Discuss Knee Hub progress.
- Open Knee(s)
- Snehal received comments from the rest of the authors on MRI data manuscript. She made all necessary recommended corrections. She requested Ahmet to review the draft before submission.
- Snehal requested Stanford group to create a DOI for a static copy of the MRI data required to be submitted with the manuscript. Once the DOI is created, she will submit the paper.
- Snehal showed some data fitting results to find zero force-displacement location in tissue tests. A third order polynomial will not work and may need to use an exponential function.
- Knee Hub
- Ariel and Snehal have been working on developing specifications for material model assignment for all tissues, in situ strain assignment for ligaments and defining coordinate systems.
- Generation 1 manual has been used for guidance. Material model definitions for ligaments and cartilage will be kept the same (cartilage: incompressible Neo-Hookean material, ligaments: nearly incompressible, transversely isotropic hyperelastic fiber material with a Mooney-Rivlin ground substance).
- Menisci and quadriceps tendon will also be assigned nearly incompressible, transversely isotropic hyperelastic fiber material with a Mooney-Rivlin ground substance. Exact parameters to be used have not been determined yet.
- Fiber direction will be specified for each element.
- Most in situ strain values have also been taken from generation 1 manual. For PCL, PTL and QAT initial strain value will be set to zero due to lack of information.
- Optimization of in situ strains will be done in calibration phase.
- Mechanical axis for femur coordinate system will be assumed passing vertically (based on MRI) through the most distal point on the posterior surface of the femur. This is due to the lack of MRI data for femoral head.
- All the discussed changes will be made to the specifications and Ahmet will review the document.
- Rodrigo Lopez-Navarro has started his summer internship with the group and will be here for 8 weeks. He will be working on getting the proximity map between the bones (to obtain a potential cartilage contact map) using python scripts developed by Rici to animate the tibia-femur motion. He has started working on calculating ligament length changes using similar approaches.