Unicondylar Tibia Implant Asymmetric Geometry
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing implant devices for unicondylar knee arthroplasty often suffer from reliability and performance issues due to poor anatomical conformance, particularly when used in compartments other than their design intent, leading to suboptimal fit and patient complications.
Innovation Solution
The development of anatomically shaped tibial implant devices with specific edge configurations, including varying curves and orientations, to better match the anatomical geometry of the tibia, ensuring improved fit and performance across different compartments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If implant devices are designed for specific compartments (medial or lateral), then anatomical conformance is improved for that compartment, but the device cannot be used in the opposite compartment without compromising fit and performance
Solution Approach 1:
The implant device is designed with a universal geometry that can be appropriately oriented to fit both medial and lateral tibial compartments. The device includes a baseplate with a top surface having a first geometry and a bottom surface having a second geometry, allowing the same device to be implanted in either compartment by orienting it appropriately, eliminating the need for separate medial and lateral specific implants
2Adaptability or versatility
If implant devices are made interchangeable between compartments, then versatility is improved, but anatomical conformance and fit are compromised
Solution Approach 1:
The implant device incorporates asymmetric geometries on its top and bottom surfaces that are specifically designed to conform to the asymmetric anatomy of the tibial plateau. The top surface geometry matches the articular surface while the bottom surface geometry matches the resected bone surface, allowing proper anatomical conformance when the device is oriented correctly in either medial or lateral compartment
3Manufacturing precision
If patient specific implants are used based on scanning, then anatomical fit is improved, but cost and exposure to medical scanning increase
Solution Approach 1:
The implant device incorporates adjustable parameters including different sizes, curvatures, and geometries that can be selected based on standard anatomical variations. This allows the device to accommodate a range of tibial anatomies without requiring patient-specific customization, eliminating the need for expensive scanning and custom manufacturing while maintaining good anatomical fit
Data Source
AI summary
Unicondylar tibia implant devices having a bone-facing, distal side that can be detailed with cement fixation features and may include any of or a plurality of grooves, pegs, fins, rails, cavities, and/or coating whereby the geometry of the implant device improves implant-to-cement or cement-to-bone fixation characteristics exceeding that of a traditional flat surface. The implant device may also include a proximal side facing away from the bone-facing, distal side and having a geometry that provides either articulation with (cartilage and meniscal substituting) or receipt of a secondary device coupleable to the implant device on the distal side of the secondary device that features an away-from-bone facing articulating feature. Additionally, the geometry of the implant device in anterior-posterior and medial-lateral directions, among other directions, provides a variety of improvements relative to currently available devices.