Talar Dome Implant With Fusion Interfaces and Three-Cut Preparation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current total talar implants do not allow for fusion with either the navicular and/or calcaneus, leaving limited options for patients with talar necrosis or subsidence, with amputation being undesirable and fusion being a preferred alternative.
Innovation Solution
A talar dome prosthesis with a mounting surface comprising at least three substantially flat bone-contacting surfaces that are not co-planar, accompanied by a guide instrument for reamer and saw to simplify the preparation of the talus, reducing the number of required cuts from four to three.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current total talar implants are used, then ankle replacement is achieved, but fusion with navicular and/or calcaneus is not possible
Solution Approach 1:
The talar implant is divided into separate modular components: a talar body component and a dome component. The talar body component includes a first interface for potential fusion with the calcaneus and a second interface for potential fusion with the navicular, while the dome component articulates with the tibia. This segmentation allows selective fusion options while maintaining ankle replacement functionality.
Solution Approach 2:
The talar body component is designed with multiple interfaces that can serve different functions: the first interface can fuse with the calcaneus, the second interface can fuse with the navicular, or both can fuse simultaneously. This multi-functional design provides versatility in surgical options, allowing the same implant to accommodate different patient needs and anatomical conditions.
2Ease of manufacture
If traditional mounting surfaces are used, then attachment to talus is achieved, but surgical preparation is complex requiring four cuts
Solution Approach 1:
The mounting surface is segmented into three distinct flat surfaces (anterior, posterior, and lateral surfaces) that are not coplanar. Each surface can be prepared independently with simpler cutting guides, reducing the overall complexity of the surgical preparation process compared to traditional four-cut requirements.
Solution Approach 2:
The mounting surface geometry is changed from a traditional coplanar four-surface design to a three-surface non-coplanar configuration. This parameter change simplifies the surgical preparation by reducing the number of required cuts from four to three, while still providing adequate attachment stability to the talus bone.
Data Source
AI summary
Provided is a prosthesis for ankle arthroplasty including a talar dome component configured to be attached to a talus bone. Also provided is a guide instrument for guiding a reamer to prepare a talus to receive the talar dome component.