Computer-Assisted Ligament Graft Placement Using 3D Deformable Simulation
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Solution Overview
Problem
Current methods for ligament reconstruction in knee surgery, such as those involving ACL injuries, face challenges due to the complexity of knee joint anatomy and the difficulty in accurately determining optimal graft placement, as they often rely on simplistic linear models that do not account for the geometric properties of the ligament graft and the impingement of bones, leading to potential instability and premature degeneration.
Innovation Solution
A computer-assisted orthopedic surgery system that uses a position measurement device with markers to track the position and orientation of bones and a pointer, allowing for the determination of ligament graft placement based on realistic simulations of deformable ligament trajectories, taking into account the three-dimensional shapes of bones and the involvement of surrounding structures, and providing real-time data on joint laxities and impingement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a simple linear model is used to determine graft placement, then the surgical procedure is simpler and faster, but the accuracy of graft placement deteriorates leading to improper positioning
Solution Approach 1:
The patent creates a virtual three-dimensional model of the patient's knee joint that copies and represents the actual anatomical structures. This virtual model allows surgeons to simulate and evaluate multiple graft placement scenarios before making the actual surgical incisions, thereby achieving high placement accuracy without compromising surgical efficiency. The virtual model serves as a digital replica that can be manipulated and analyzed without affecting the patient.
Solution Approach 2:
The system performs preliminary planning and simulation of graft placement trajectories before the actual surgery. By pre-calculating optimal insertion points and trajectories using the virtual model, the system eliminates the need for complex intraoperative calculations, thereby maintaining surgical efficiency while ensuring accurate graft placement. The preliminary action includes simulating knee motion through various ranges to predict ligament behavior.
Solution Approach 3:
The patent transitions from two-dimensional surgical planning to three-dimensional virtual modeling. By representing the knee joint, bones, and ligaments in three dimensions with realistic geometric properties, the system captures the complexity of anatomical structures and their interactions during knee motion. This dimensional enhancement allows for accurate prediction of ligament trajectories and graft behavior without complicating the surgical procedure.
2Manufacturing precision
If a realistic simulation of deformable ligament trajectories is used, then the graft placement accuracy is improved, but the computational complexity and time required increase
Solution Approach 1:
The patent replaces complex mechanical measurement devices and manual calculation methods with a computer-based virtual modeling system. The computational model automatically calculates ligament trajectories, deformation, and tension forces through numerical simulations, eliminating the need for complex physical measurement apparatus. This substitution reduces system complexity while maintaining high accuracy in graft placement predictions.
Solution Approach 2:
The system performs all complex computational simulations and calculations during the preoperative planning phase, before the actual surgery begins. By completing the computationally intensive tasks of modeling ligament deformation, calculating trajectories, and optimizing graft placement in advance, the system eliminates the need for complex real-time computations during surgery. This preliminary action reduces the complexity burden from the surgical procedure itself.
3Manufacturing precision
If the three-dimensional shapes of bones and surrounding structures are considered, then the accuracy of determining optimal graft placement is improved, but the measurement and analysis difficulty increases
Solution Approach 1:
The patent creates a virtual three-dimensional copy of the patient's knee joint anatomy using medical imaging data (CT or MRI scans). This virtual model accurately represents the three-dimensional shapes of bones, ligaments, and surrounding structures without requiring direct physical measurement during surgery. The copying process automates the complex measurement tasks, converting raw imaging data into a usable three-dimensional geometric model that captures all anatomical details.
Solution Approach 2:
The system replaces manual measurement and analysis methods with automated computer-based processing. The software automatically extracts three-dimensional geometric information from medical images, constructs virtual models of anatomical structures, and performs complex calculations of ligament trajectories and graft optimization. This substitution eliminates the need for surgeons to manually measure and analyze complex three-dimensional anatomy, significantly reducing the difficulty of measurement and analysis.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system enhances the accuracy of ligament graft placement, reduces post-operative instability, and allows for more precise reconstruction by considering the actual geometric and kinematic properties of the knee joint, thereby improving surgical outcomes.
Implementation Method 1
a position measurement device with markers to track the position and orientation of bones and a pointer
Data Source
AI summary
A computer assisted orthopedic surgery system for ligament graft reconstruction includes a system for obtaining data indicative of a location for ligament graft placement with respect to at least a first bone and a second bone. The system includes a position determining device that is capable of tracking the relative movements of the first and second bones using reference bodies that are attached to the first and second bones and a pointer that has a tip for contacting a surface of at least one of the first and second bones to capture one or more reference points. The system further includes a computer that is configured to determine and track intraoperative positions of the reference bodies and the pointer and to provide isometric and impingement data for a ligament graft placement based on a realistic simulation of a trajectory of a deformable ligament graft.