Mesh-Free Bone Model for Trabecular Fragmentation
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Solution Overview
Problem
Current mesh-based finite element analysis methods are inadequate in modeling the fragmentation and redistribution of trabecular bone during implant migration, leading to inaccuracies in simulating the mechanical behavior of bone-implant systems, particularly in cases of osteoporotic fractures where implant stability and migration are critical.
Innovation Solution
A mesh-free bone model using Smoothed Particle Hydrodynamics (SPH), Element-Free Galerkin (EFG), Reproducing Kernel Particle Method (RKPM), or Discrete Element Method (DEM) to represent trabecular bone as nodes or particles that can break, move, and redistribute under load, allowing for more accurate simulation of fragmentation and compaction phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mesh-based finite element analysis is used to model bone-implant systems, then computational framework is established, but accuracy in modeling fragmentation and redistribution of trabecular bone deteriorates
Solution Approach 1:
The patent replaces the traditional mesh-based finite element analysis approach with a mesh-free particle-based approach. Instead of using a mesh of elements to represent bone tissue, the invention uses individual particles or nodes that can independently represent trabecular bone structures. This substitution allows for more accurate modeling of fragmentation and redistribution phenomena while avoiding the complexity of mesh generation and manipulation.
Solution Approach 2:
The patent segments the bone tissue into discrete particles or nodes that can individually respond to mechanical loading. Each particle can represent a trabecular element that may fragment or redistribute independently, providing a more accurate representation of bone mechanics during implant migration compared to continuous mesh-based approaches.
2Reliability
If mesh-free particle-based model is used to represent trabecular bone, then accuracy of fragmentation simulation is improved, but computational complexity increases
Solution Approach 1:
The particle-based model allows each particle to autonomously respond to mechanical stresses and interact with neighboring particles through defined interaction laws. This self-service approach enables automatic handling of fragmentation and redistribution processes without requiring complex external control mechanisms, improving reliability while managing computational complexity through localized particle interactions.
Solution Approach 2:
The patent employs parameter changes in the form of material properties and interaction laws that govern particle behavior. By adjusting parameters such as particle stiffness, density, and interaction forces, the model can accurately simulate various bone quality scenarios and implant migration mechanisms, enhancing predictive accuracy while maintaining computational efficiency through parameter optimization.
Data Source
AI summary
A computer-implemented bone-implant system evaluation method for application of mesh-free analysis of a bone-implant system for evaluation of performance of a bone-implant system for an implant implanted within the bone structure at an anatomical site, said method comprising (i) receiving a set of bone structure data set, wherein set of bone structure data includes data indicative of the bone structure at an anatomical site; (ii) inputting an implant data set and inputting the position of the implant data set, wherein the implant is selected based upon the biomechanical requirements for the anatomical site and the position and of the implant data set is indicative of the position of the implant with respect to the anatomical site, wherein implant data set includes data representative of the geometry and materials properties of the implant; (iii) creating a bone-implant model, wherein said bone implant-model includes a mesh-free model of trabecular bone at the anatomical site wherein the bone-implant model is formed from the bone structure data set from step (i) and the implant data set from step (ii), and wherein the mesh-free model of trabecular bone is indicative of the trabecular bone structure of the bone structure at the anatomical site; and (iv) determining a biomechanical result based upon computer simulated loading of the bone-implant system based upon mesh-free analysis of the bone-implant model, wherein the biomechanical result includes data based on the displacement of the implant relative to the bone of bone-implant model.