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Release Name: SSM Knee Executable

Release Notes

The statistical shape model was developed using 50 natural healthy knees (25 males, 25 females) consisting of the distal femur, proximal tibia, and patella bone as well as associated articular surface cartilages. Attachment sites and line-of-actions for select soft tissue structures were also included. Local coordinate systems for each bone are represented as triads using 1D beam elements. Alignment of the joint is in the MRI as-scanned position. Bones are modeled as 2D surface meshes using R3D3 tri elements. Cartilages are modeled as C3D8R hexahedral elements and soft tissue attachment sites as nodes (no elements). Executable Option: This executable code has been pre-programmed with the cartilage and is able to generate models of bone, cartilage and ligaments for pre-specified instances. DU_SSM_MODES/distrib/DU_SSM_MODES.exe Generates mean and instances at +/-1.5 std deviation for Modes 1 to 5 Directions for executable option: • The R2013a MATLAB Compiler Runtime (MCR) must be downloaded. It is available at http://www.mathworks.com/products/compiler/mcr/. • Option 1: Double-click on the executable listed above to generate the files. • Option 2: Run the application in DOS command window to see application information and real-time status. • Model files created are in .inp format for use with Abaqus and other FE software. • MODEL.inp is the main file in each folder below and calls on all other files. DU_SSM_MODES Folders: • Mean • Mode 1 +1.5 standard deviations • Mode 1 -1.5 standard deviations • Mode 2 +1.5 standard deviations • Mode 2 -1.5 standard deviations • Mode 3 +1.5 standard deviations • Mode 3 -1.5 standard deviations • Mode 4 +1.5 standard deviations • Mode 4 -1.5 standard deviations • Mode 5 +1.5 standard deviations • Mode 5 -1.5 standard deviations File Names for a representative input file deck. All files created in Abaqus input format (.inp). Model.inp High level input file BONE_FEM.inp Contains nodes for femur BONE_TIB.inp Contains nodes for tibia BONE_PAT.inp Contains nodes for patellar bone ELEM_FEM.inp Contains elements for femur ELEM_TIB.inp Contains elements for tibia ELEM_PAT.inp Contains elements for patellar bone CART_FEM.inp Contains nodes for femoral cartilage CART_TIB_LAT.inp Contains nodes for lateral tibial cartilage CART_TIB_MED.inp Contains nodes for medial tibial cartilage CART_PAT.inp Contains nodes for patellar cartilage ELEM_FEMCART.inp Contains elements for femur cartilage ELEM_TIBLATCART.inp Contains elements for lateral tibial cartilage ELEM_TIBMEDCART.inp Contains elements for medial tibial cartilage ELEM_PATCART.inp Contains elements for patella cartilage CS_FEM.inp Contains nodes defining ML, AP and SI axes of the femur CS_TIB.inp Contains nodes defining ML, AP and SI axes of the tibia CS_PAT.inp Contains nodes defining ML, AP and SI axes of the patella LIGAMENTS.inp Contains ligament input filenames for reference to Model.inp Note: Locations are provided for the following soft tissue structures in respective input files (.inp): • ACL: Anterior Cruciate Ligament • LCL: Lateral Collateral Ligament • LPFL: Lateral Patellofemoral Ligament • MCL: Medial Collateral Ligament • MPFL: Medial Patellofemoral Ligament • PAT-LIG: Patellar Ligament • PCAPL: Lateral Posterior Capsule • PCAPM: Medial Posterior Capsule • PCL: Posterior Cruciate Ligament • RECT_FEM: Rectus-Femoris • SMCL: Superior Medial Collateral Ligament • VASTI: Medialis Obliquus, Medialis Longus, Intermedius, Lateralis Obliquus, Lateralis Longus