Trial Insert Assembly for Total Ankle Replacement Alignment
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Solution Overview
Problem
Current total ankle replacement (TAR) procedures face challenges in accurately sizing and positioning implants to achieve proper alignment and distribution of mechanical forces, leading to potential instability and limited range of motion in the ankle joint.
Innovation Solution
A trial insert system comprising a first member with an engagement channel and a second member with an engagement member, allowing for translational movement along a longitudinal axis, facilitates the selection and positioning of tibial and talus prostheses to achieve optimal joint alignment and motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional TAR prosthesis with fixed positioning is used, then the implantation process is simplified, but the precision of component alignment and positioning deteriorates
Solution Approach 1:
The trial insert assembly incorporates movable members that allow dynamic adjustment of the tibial component position relative to the talus component. The engagement channel and engagement member enable translational movement along the longitudinal axis, allowing surgeons to optimize alignment and positioning before final implantation, thereby achieving precise component alignment while managing system complexity through controlled mobility.
2Measurement precision
If trial insert assembly with movable components is used, then the positioning accuracy is improved, but the device complexity increases
Solution Approach 1:
The trial insert assembly is divided into distinct segmented components: a first member representing the talus prosthesis, a second member representing the tibial prosthesis, and a trial insert component. This segmentation allows each component to be independently positioned and adjusted, improving positioning accuracy while managing complexity through modular design that enables separate optimization of each segment.
Solution Approach 2:
The trial insert acts as an intermediary component between the talus and tibial prostheses. It includes an engagement channel that receives an engagement member from the tibial prosthesis, allowing controlled relative movement and precise positioning. This intermediary mechanism enables accurate alignment measurement and adjustment without requiring direct complex coupling between the main prosthetic components.
3Adaptability or versatility
If fixed alignment system is used, then the device complexity is reduced, but the range of motion achievement deteriorates
Solution Approach 1:
The trial insert assembly enables dynamic positioning adjustment to achieve optimal range of motion. By allowing the tibial component to move relative to the talus component within the engagement channel, the system can be adapted to match the patient's natural ankle motion arc, achieving full articulation and physiological range of motion while managing complexity through the focused mobility of the trial insert mechanism.
Data Source
AI summary
A trial insert having a first member having an engagement channel extending from a bottom surface towards a top surface and along a first direction that extends from a first end to a second end. The trial insert has a second member having an engagement member extending away from a top surface and along a second direction that extends from a first end to a second end, where the engagement member is received within the engagement channel, and where the first member is translatable relative to the second member along a longitudinal axis of the trial insert.