Modular Revision Knee Trial Assembly for Precise Implant Positioning
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Solution Overview
Problem
Existing revision knee arthroplasty procedures are costly and complex, requiring multiple components and detailed documentation of provisional component positions, which complicates the surgical process.
Innovation Solution
A modular system of provisional components, including adaptors and stem extensions, that can be assembled in vivo and removed as an assembly, maintaining relative positions for easy reference and simplifying the creation of permanent implants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple provisional components are used in revision knee arthroplasty, then the ability to match patient anatomy is improved, but the device complexity and surgical procedure complexity increase
Solution Approach 1:
The provisional system is divided into multiple interchangeable components including adaptors with different offsets, stem extensions of varying lengths, and trial components. This segmentation allows surgeons to combine different components to match specific patient anatomies while maintaining a modular, organized system that simplifies inventory and selection.
Solution Approach 2:
The adaptor system serves multiple functions: it provides offset adjustment, connects different stem extensions, and interfaces with various trial components. This multi-functionality reduces the total number of specialized components needed while maintaining the ability to address diverse anatomical requirements.
2Manufacturing precision
If provisional component positions are precisely documented, then permanent implant positioning accuracy is improved, but the time and complexity of the surgical procedure increase
Solution Approach 1:
The provisional assembly serves as a physical copy or template of the intended permanent implant configuration. By maintaining the same relative positions and relationships during the provisional stage, the assembly itself becomes the documentation tool, eliminating the need for separate detailed recording while ensuring positioning accuracy is transferred to the permanent implants.
Solution Approach 2:
The provisional components are assembled in their final positions before the permanent implants are placed. This preliminary arrangement allows the surgeon to verify positioning, make adjustments, and establish the correct configuration ahead of time, ensuring accuracy is achieved before committing to the permanent implant placement.
3Adaptability or versatility
If a modular system with multiple adaptors and extensions is used, then adaptability to different anatomies is improved, but the quantity of components and cost increase
Solution Approach 1:
The modular system allows dynamic reconfiguration during surgery. Adaptors and stem extensions can be interchanged based on the specific anatomical requirements encountered intraoperatively. This dynamic adaptability enables a single set of modular components to serve multiple anatomical configurations without requiring a complete inventory of specialized components for each scenario.
Data Source
AI summary
According to one example, a for revision knee arthroplasty is disclosed. According to this example, the method can include shaping a bone of a patient to create one or more recesses therein, selecting a stem provisional, disposing the stem provisional within the one or more recesses, and assembling in vivo the stem provisional with both a first provisional component configured to simulate a shape of one of a tibial tray implant or a femoral implant and a second provisional component configured to simulate a shape of at least one of a sleeve component, a cone component or a keel component of an implant.