Talar Implant Angular Coupling for Anatomical Adaptation
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Solution Overview
Problem
Existing ankle prostheses face challenges with insufficient support for a wide range of patient anatomies and disease states, leading to issues such as subsidence, loosening, and bone loss, which result in pain and reduced mobility.
Innovation Solution
A talar implant system with an articulation component and a distal portion that can be rigidly coupled at various angular positions, allowing for adaptation to different patient anatomies and enabling easy replacement of the articulating portion when worn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed angular position is used for coupling the distal portion to the base, then the manufacturing and implantation process is simplified, but the adaptability to different patient anatomies is reduced
Solution Approach 1:
The coupling mechanism transitions from a fixed rigid connection to a dynamic adjustable connection that allows selection from multiple discrete angular positions. The distal portion can be coupled at various angles relative to the base plane, enabling adaptation to different patient anatomies while maintaining a relatively simple mechanical implementation through predefined angular options rather than continuous adjustment.
2Ease of repair
If the articulation component is permanently fixed to the distal portion, then the structural strength is maximized, but the ease of replacement when worn is reduced
Solution Approach 1:
The implant is divided into separable components: the distal portion, the articulation component, and the base. The articulation component can be detached from the distal portion through a coupling mechanism, allowing replacement of the worn articulation component without removing the distal portion or base. This segmentation maintains sufficient structural strength during use while enabling easy repair and replacement.
3Adaptability or versatility
If a custom-designed prosthesis is used for revision procedures, then the fit and support for specific patient anatomies is improved, but the device complexity and surgical difficulty increase
Solution Approach 1:
The implant system is designed with universal components that can be used across different patient anatomies and surgical scenarios. The distal portion, articulation component, and base are designed as standardized parts that can be combined in different configurations, eliminating the need for custom-designed prostheses while maintaining good fit and support through selective assembly of appropriate components.
4Strength
If the articulation component is made larger to provide better support, then the load-bearing capacity is improved, but the risk of subsidence into the talus increases
Solution Approach 1:
By separating the articulation component from the distal portion, the system allows optimization of each component independently. The articulation component can be designed with appropriate size and geometry for load-bearing without excessive mass that would cause subsidence. The distal portion provides stable anchorage in the talus while the articulation component provides necessary support, eliminating the need to make the entire prosthesis larger.
Data Source
AI summary
A talar implant system and method in one embodiment includes an articulation component with an articulating surface extending upwardly from a first plane and configured to articulate with a tibial component, and a distal portion for implanting in a bone, the distal portion having a longitudinal axis and configured to be rigidly coupled with respect to the first plane at any angular position selected from a range of angular positions within a second plane perpendicular to the first plane.