3D Glenoid Surface Modeling for Precise Shoulder Implant Alignment
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Solution Overview
Problem
Current methods for selecting and implanting a glenoid component in shoulder prosthetics are imprecise, particularly when the patient's glenoid cavity is severely damaged, leading to potential loosening due to misalignment and improper force distribution.
Innovation Solution
A method and apparatus for modeling the glenoid surface of a scapula using cartographic data to generate a theoretical glenoid surface, allowing for precise positioning and production of a customized glenoid component that replicates the pre-degeneration geometry, using a surgical apparatus with infrared markers and computer-assisted modeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual assessment and empirical estimation are used to select and implant a glenoid component, then the surgical procedure is simple and quick, but the implantation precision and alignment accuracy deteriorate
Solution Approach 1:
The patent applies preliminary action by creating a 3D digital model of the patient's glenoid surface before surgery using cartographic data and ellipsoid fitting. This pre-surgical planning allows precise determination of implantation position, orientation, and component size, eliminating the need for complex intraoperative adjustments while achieving high precision.
Solution Approach 2:
The patent uses copying by creating a digital 3D replica of the patient's actual glenoid surface geometry through cartographic mapping. This digital copy enables virtual implantation trials and precise measurement without requiring physical replicas during surgery, reducing device complexity while maintaining high accuracy.
2Reliability
If a standard glenoid component is implanted without customization, then the surgical procedure is simpler, but the biomechanical compatibility and long-term stability deteriorate
Solution Approach 1:
The patent applies parameter changes by using the fitted ellipsoid model to precisely determine optimal implantation parameters including position, orientation, and component size specific to each patient's anatomy. This allows selection or customization of glenoid components that match the patient's unique geometry, improving biomechanical compatibility and stability.
Solution Approach 2:
The patent enables preliminary determination of the optimal glenoid component specifications through 3D modeling and ellipsoid fitting before manufacturing or implantation. This pre-planning ensures the selected or customized component will achieve optimal biomechanical alignment and stability from the first implantation.
3Manufacturing precision
If the glenoid component is implanted without accurate modeling of the original surface, then the surgical time is reduced, but the force distribution and alignment deteriorate leading to loosening
Solution Approach 1:
The patent performs the complex 3D modeling, cartographic mapping, and ellipsoid fitting operations before surgery to create a complete implantation plan. This preliminary action transfers the time investment to the pre-surgical phase, allowing the actual implantation to proceed quickly with precise guidance from the pre-established model.
Solution Approach 2:
The patent creates a digital 3D copy of the glenoid surface with precise geometric data that can be used repeatedly for planning and guidance. This digital replica enables accurate determination of implantation parameters without requiring repeated physical measurements during surgery, reducing surgical time while maintaining high precision.
Data Source
AI summary
An apparatus and modeling method of the present invention includes the successive steps of generating cartographic data representative of points belonging to a glenoid surface; distinguishing from among the cartographic data a first group of cartographic data corresponding to a first part of the glenoid surface, the first surface part being situated farthest down in the vertical direction in relation to the scapula; calculating from the first group of cartographic data a first ellipsoid portion that coincides substantially with the first surface part; and obtaining a theoretical glenoid surface from the first ellipsoid portion. By virtue of the theoretical glenoid surface obtained by this method, it is possible to assist the surgeon in optimizing the position of implantation of a glenoid component and to produce a glenoid component “made to measure” for the scapula that is to be fitted with a prosthesis.