Tibial Prosthesis Baseplate Cement Fixation Design
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Solution Overview
Problem
Existing tibial prostheses face challenges in achieving stable fixation and durability due to micro-motion and lack of rigidity, and existing systems do not allow for seamless switching between cemented and non-cemented apparatuses, and existing systems do not allow for efficient surgical flexibility.
Innovation Solution
The tibial prosthesis features a baseplate with a distal surface designed for improved bonding with bone cement, including a keel and a plurality of fins that enhance fixation and durability, and a system that allows intraoperative switching between cemented and non-cemented apparatuses with shared geometry, reducing surgical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a tibial baseplate is implanted without distal features for cement bonding, then the implantation process is simpler, but the bonding strength with bone cement is reduced leading to micro-motion and reduced durability
Solution Approach 1:
The baseplate is segmented with multiple distinct distal features including pockets, flutes, and fins that can be independently optimized for cement bonding. These segmented features allow the cement to penetrate and anchor at multiple locations, significantly improving bonding strength without requiring a complete redesign of the entire baseplate structure.
Solution Approach 2:
Distal features are added only to specific regions of the baseplate where cement bonding is most critical, rather than modifying the entire structure. The pockets, flutes, and fins are strategically positioned at the distal surface to maximize cement interlocking while maintaining the overall simplicity and functionality of the baseplate design.
2Reliability
If a tibial baseplate lacks rigidity and torsional strength, then the manufacturing and implantation are easier, but the overall durability and stability of the implant is reduced
Solution Approach 1:
The tibial keel features curved and contoured geometries that naturally distribute mechanical loads more effectively, enhancing rigidity and torsional strength. The curved flutes and rounded fins provide structural reinforcement while maintaining smooth surfaces that are easier to manufacture using standard machining processes.
Solution Approach 2:
The baseplate incorporates a composite structure combining the keel, fins, and flutes as integrated load-bearing elements that work together to enhance overall rigidity. This composite design allows the structure to resist torsional forces more effectively while being manufactured as a single piece, avoiding the need for complex assembly processes.
3Adaptability or versatility
If the system allows switching between cemented and non-cemented apparatuses, then surgical flexibility is improved, but the device complexity and surgical time increase
Solution Approach 1:
The tibial baseplate is designed with universal distal features that serve multiple functions: they provide cement bonding surfaces when cement is used, and simultaneously offer structural anchoring points for non-cemented fixation methods. This multi-functionality allows the same baseplate design to accommodate both cemented and non-cemented fixation approaches without requiring separate inventory or complex intraoperative decisions.
Solution Approach 2:
The baseplate is pre-designed with integrated distal features that are ready for both cemented and non-cemented fixation methods before implantation. The pockets, flutes, and fins are manufactured in advance as part of the baseplate structure, eliminating the need for additional intraoperative modifications or component exchanges, thereby reducing surgical time while maintaining flexibility.
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 1E~1G
AI summary
According to one example, a tibial prosthesis that optionally includes a baseplate and a tibial keel. The baseplate optionally including: a distal surface sized and shaped to substantially cover a proximal resected surface of a tibia; a proximal surface opposite the distal surface, the proximal surface having a lateral compartment and a medial compartment opposite the lateral compartment; a periphery extending between the distal surface and the proximal surface; a first pocket formed in the baseplate and recessed from the distal surface, wherein the first pocket is configured to receive a bone cement therein; a second pocket formed in the baseplate and recessed from the first pocket, wherein the second pocket is configured to receive a portion of the bone cement. The tibial keel extending distally from the distal surface to define a longitudinal tibial keel axis.