Hip Prosthesis Cup Positioning via Navigation
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Solution Overview
Problem
Current methods for positioning hip joint prostheses focus primarily on range of motion optimization, disregarding biomechanical stability and interactions between implants and anatomical structures, leading to inadequate fixation and potential dislocations.
Innovation Solution
A method that determines the geometric shape of the joint socket and cup, defines target areas for bone contact, and calculates optimal cup positioning and orientation based on multiple anatomical features, including containment requirements and alignment with the acetabulum, using a navigation system to ensure proper fixation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cup positioning is optimized for range of motion using formula-based approaches, then range of motion is improved, but biomechanical stability and fixation quality deteriorate
Solution Approach 1:
The patent transforms the cup positioning optimization from a single-parameter (range of motion) approach to a multi-parameter approach that includes containment metrics, anatomical landmark alignment, and biomechanical stability criteria. The system calculates multiple parameters simultaneously and uses weighted optimization to balance competing requirements, thereby improving both range of motion and biomechanical stability.
Solution Approach 2:
The patent implements a feedback mechanism where the navigation system continuously monitors cup positioning against pre-defined target areas and anatomical landmarks. The system provides real-time feedback to the surgeon about containment quality and alignment accuracy, allowing adjustments to be made during implantation to achieve optimal biomechanical stability while maintaining adequate range of motion.
2Ease of manufacture
If cup positioning follows classical safe zone guidelines, then implantation simplicity is improved, but interaction with anatomical structures and fixation quality deteriorate
Solution Approach 1:
The patent introduces a navigation system as an intermediary between the surgeon and the implantation process. This intermediary provides real-time guidance on cup positioning relative to anatomical landmarks and target areas, bridging the gap between simple implantation procedures and precise fixation requirements. The system translates complex anatomical relationships into actionable positioning guidance.
Solution Approach 2:
The patent performs preliminary identification and mapping of target areas, anatomical landmarks, and containment zones before cup implantation. By pre-defining optimal positioning parameters and target areas based on individual patient anatomy, the system enables surgeons to achieve precise fixation without requiring complex intraoperative adjustments, thereby maintaining implantation simplicity while improving fixation quality.
3Reliability
If TAL-based approach is used for cup positioning, then dislocation reduction is improved, but comprehensiveness of biomechanical optimization deteriorates
Solution Approach 1:
The patent merges the TAL-based dislocation prevention approach with comprehensive biomechanical optimization criteria including containment metrics, anatomical landmark alignment, and stability assessment. Rather than relying solely on TAL orientation, the system integrates multiple independent criteria that work together to achieve both dislocation reduction and overall biomechanical optimization, creating a more robust positioning strategy.
Data Source
AI summary
The present invention relates to a method for planning the positioning of a ball joint prosthesis, in particular a hip joint prosthesis, wherein the prosthesis includes a stem and a cup and the method comprises the following steps: —determining the geometric shape of the joint socket, in particular the acetabulum, and the geometric shape of the cup which is to be placed; —defining target areas where the cup has to abut the bony structure of the joint socket, in particular the acetabulum, in order for the cup to be sufficiently fixed; —determining actual areas of the cup which will abut the bony structure of the joint socket, in particular the acetabulum, when the cup is placed; —defining a requirement for the position and/or orientation of the cup on the basis of the position and/or size of the target areas and/or actual areas. The present invention also relates to a method for optimizing the positioning of a ball joint prosthesis, in particular a hip joint prosthesis, wherein the prosthesis includes a stem and a cup and the method comprises the following steps: —defining at least one requirement for the position and/or orientation of the cup; —calculating an optimum position and/or orientation of the cup on the basis of all the defined requirements being fulfilled.