Pre-assembled Hinge Knee System for Distal Femoral Replacement
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Solution Overview
Problem
Current hinged knee systems for revision surgeries lack intraoperative flexibility, requiring longer surgical times and increased complexity due to the need for assembling components during procedures, and often require additional resections or switching to total femur reconstruction, which complicates distal femoral replacement procedures.
Innovation Solution
A hinged knee system with pre-assembled femoral components and anteriorly accessible hinge mechanisms, allowing for intraoperative switching between non-hinged and hinged options, and featuring adjustable distal femoral replacement components to minimize resections and simplify surgical techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hinged knee systems are used for revision surgeries, then immediate post-operative mobility and pain decrease are improved, but surgical working time increases and surgical flexibility decreases
Solution Approach 1:
The hinge mechanism is pre-assembled to the femoral component before surgery, eliminating the need for intraoperative assembly. This preliminary action reduces surgical working time while maintaining the reliability of immediate post-operative mobility provided by the hinge mechanism.
2Reliability
If custom metal augments are used to replace degraded bone, then bone replacement is achieved, but device complexity and surgical technique complexity increase
Solution Approach 1:
The system includes a universal set of metal augments in multiple sizes that can be used to replace various degrees of degraded bone. This universal design allows a single set of augments to serve multiple functions and patient scenarios, reducing device complexity while maintaining reliable bone replacement capability.
3Stability of the object's composition
If traditional hinge knee systems are used, then knee motion is constrained and joint stability is improved, but ease of operation decreases due to complex assembly requirements
Solution Approach 1:
The hinge mechanism is pre-assembled to the femoral component during manufacturing, so that during surgery the surgeon only needs to perform simple attachment steps to the tibial component. This preliminary assembly dramatically improves ease of operation while maintaining the joint stability provided by the hinge mechanism.
4Reliability
If distal femoral replacement is performed with traditional systems, then bone replacement is achieved, but loss of time increases due to need for additional resections
Solution Approach 1:
The system allows selective replacement of only the distal femoral component while preserving the proximal femur and other structures. This segmented approach to replacement minimizes the need for additional resections and reduces surgical time while achieving reliable distal femoral replacement.
Data Source
AI summary
Methods and systems are provided for a hinge knee system. A hinge knee system may comprise a femoral component; an insert; a tibial tray configured to be coupled to the insert; a tibial bushing configured to be disposed between the tibial tray and the insert; a poly locking screw configured to secure the tibial tray to the insert; a hinge box configured to be disposed between the femoral component and the insert; one or more cross-pin bushings configured to be disposed within the hinge box; a cross-pin configured to secure the hinge box to the femoral component; a hinge post configured to couple the hinge box to the tibial tray; and a hinge post set screw configured to secure the hinge box to the hinge post.