Pre-operative Implant Sizing Using 3D Bone Model Reconstruction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current orthopedic surgery planning using 2D X-ray images is imprecise due to overlapping bone structures and challenges in obtaining precise lateral or anterior positioning, leading to incorrect implant size planning.
Innovation Solution
A system and method that uses a processor and computer-readable memory to generate a 3D bone model from 2D patient images with a scale marker, allowing for accurate implant sizing by setting a scale, matching implant models, and outputting the appropriate implant size or model for the patient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If 2D X-ray images are used for implant sizing, then accessibility and ease of operation are improved, but measurement precision and manufacturing precision deteriorate due to overlapping bone structures and positioning difficulties
Solution Approach 1:
The patent transforms 2D radiographic images into a 3D bone model through coordinate system transformation and surface reconstruction algorithms. This dimensional conversion allows the system to overcome the limitations of 2D imaging by creating a three-dimensional representation that eliminates overlapping structures and enables precise measurement of bone geometry for implant sizing.
Solution Approach 2:
The patent introduces a scale marker as an intermediary object with known geometry that is positioned relative to the bone during imaging. This marker serves as a reference for determining the transformation between image coordinates and real-world dimensions, enabling accurate scaling and measurement despite the limitations of 2D projectional radiography.
2Device complexity
If 2D X-ray images are used for implant sizing, then device complexity is reduced, but manufacturing precision deteriorates due to inability to accurately determine 3D bone dimensions
Solution Approach 1:
The system reconstructs 3D bone geometry from 2D radiographic projections by establishing coordinate transformations and performing surface interpolation. This allows accurate determination of three-dimensional bone dimensions using relatively simple 2D imaging equipment, thereby maintaining low device complexity while achieving high manufacturing precision for implant sizing.
Solution Approach 2:
The patent creates a digital 3D copy of the patient's bone geometry through computational reconstruction from 2D images. This virtual model serves as an accurate representation that can be used for implant planning and sizing without requiring complex physical measurement devices or advanced imaging equipment.
3Adaptability or versatility
If multiple implant sizes are kept in inventory to address incorrect sizing, then adaptability is improved, but loss of substance and device complexity increase
Solution Approach 1:
The patent replaces physical trial-and-error implant fitting with a computational system that uses 3D bone modeling and virtual implant placement to determine the correct implant size before surgery. This substitution of mechanical trial fitting with digital planning eliminates the need to maintain inventories of multiple implant sizes, reducing waste while maintaining adaptability to different patient anatomies.
Data Source
AI summary
A system for sizing an implant for a patient pre-operatively comprisies a processor unit. A non-transitory computer-readable memory may be communicatively coupled to the processing unit and comprising computer-readable program instructions executable by the processing unit for obtaining at least one radiographic patient image of at least one patient bone with a scale marker relative to the bone, the scale marker having a known geometry, setting a scale of the at least one radiographic patient image using the known geometry of the scale marker, generating a three-dimensional bone model representative of the at least one patient bone using the at least one radiographic patient image and the scale, identifying an implant size and/or an implant model using implant models and dimensions of the three-dimensional bone model based on said scale, and outputting the implant size and/or the implant model for the patient.