Talar Revision Implant With Screw Fixation for Bone Loss
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Solution Overview
Problem
Existing orthopedic implants face issues with bone loss due to osteolysis, leading to loosening of the prosthesis fixation, as bone structure is resorbed and voids form, necessitating effective revision solutions to stabilize the implant.
Innovation Solution
The development of revision implant components with tapered bodies and screw holes, designed to fit the talar dome and remaining bone, providing secure coupling through screw fixation and interference connections, such as Morse tapers, to fill bone voids and ensure proper alignment and support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard total joint replacement implant is used, then the joint function is restored, but bone loss occurs over time leading to implant loosening
Solution Approach 1:
The revision implant is divided into multiple functional components: a proximal portion with a tapered head for articulation, a midportion with screw holes for fixation, and a distal portion for filling bone voids. This segmentation allows each component to address specific problems - the tapered head maintains joint function while the screw holes and void-filling portions address bone loss and fixation stability.
Solution Approach 2:
The implant exhibits local quality variations through its tapered geometry and differentiated structural zones. The proximal tapered head provides articulation surface, while the midportion with screw holes provides fixation, and the distal portion fills bone voids. This local differentiation allows the single implant to simultaneously address multiple issues including bone loss, fixation stability, and joint function.
2Reliability
If bone voids are formed due to osteolysis, then the prosthesis fixation is loosened, but filling these voids requires complex revision procedures
Solution Approach 1:
The revision implant merges multiple functions into a single component: it provides structural support, fills bone voids through its distal portion, enables secure fixation through screw holes in the midportion, and maintains joint articulation through the tapered head. This consolidation of functions into one implant reduces surgical complexity compared to using multiple separate revision components.
Solution Approach 2:
The implant design incorporates multiple functions within a single device: the tapered head provides articulation, the midportion with screw holes provides fixation, and the distal portion fills bone voids. This multi-functionality allows one implant to address all issues arising from bone loss and void formation, simplifying the revision procedure.
3Strength
If screw fixation is used to secure the implant, then the attachment strength is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The implant features an asymmetric tapered geometry that guides screw hole placement and facilitates insertion. The tapered shape provides inherent alignment cues that reduce the precision requirements for screw hole drilling while maintaining strong attachment. The asymmetric design allows screws to be inserted at specific angles that optimize fixation without requiring extremely tight tolerances.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A revision talar implant component (100A) comprising a tapered body (101) having a plurality of screw holes (107) and a tapered head (109) configured to engage a talar dome component (401) of a multi-component ankle prosthesis. A surgical method is disclosed which includes creating an incision in a patient, exposing a multicomponent ankle prosthesis implanted in a patient, disassembling at least one component of the multi-component ankle prosthesis, affixing a revision implant component to non-damaged bone using screws, and coupling the revision implant component to a talar dome of the multi-component ankle prosthesis