Tibial Augment with Varying Angles for Bone Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current knee prostheses face challenges in securely attaching to the tibia due to bone loss or deterioration, requiring significant bone cement and potentially inadequate fixation.
Innovation Solution
The design of a tibial augment with a unique exterior side surface and medial end surface configuration, including varying interior angles and a constant width medial end surface, which is secured to the tibial tray to enhance fixation and reduce cement usage by increasing the prosthesis's volume to accommodate bone loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tibial augments are used to compensate for bone loss and increase prosthesis volume, then fixation stability is improved, but device complexity increases
Solution Approach 1:
The tibial prosthesis is divided into modular components: a base tibial tray and separate tibial augments that can be selectively added. This segmentation allows the prosthesis to maintain simple geometry when bone loss is minimal, while accommodating complex bone defect scenarios through optional augment attachment, thus resolving the contradiction between simplicity and adaptability for fixation stability.
Solution Approach 2:
The tibial augments are designed to be attached to the tibial tray, with the augment's interior surface receiving the tray's exterior surface. This nesting configuration allows the augment to integrate with the existing tray structure, providing enhanced volume and fixation stability without requiring a completely separate complex device, thereby managing device complexity while improving reliability.
2Object-affected harmful factors
If tibial augments are used to reduce bone cement usage, then health hazards from cement are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The tibial augment serves as an intermediary component between the tibial tray and the patient's bone. By providing this intermediate structural element, the need for extensive bone cement is reduced, thereby minimizing cement-related health hazards. The augment's designed interface geometry ensures precise alignment and connection, managing manufacturing precision requirements while achieving the benefit of reduced cement usage.
3Adaptability or versatility
If the exterior side surface has varying interior angles, then adaptability to bone geometry is improved, but device complexity increases
Solution Approach 1:
The exterior side surface of the tibial augment features varying interior angles at different locations, allowing different regions of the augment to adapt to specific bone geometries. This local variation in surface geometry provides tailored adaptability to accommodate diverse patient anatomies without requiring complete redesign of the entire device, thus improving adaptability while controlling overall device complexity.
Data Source
AI summary
A tibial orthopedic prosthesis assembly for use during performance of a knee replacement procedure includes one or more tibial augments configured to be coupled to a tibial tray. Each tibial augment includes an exterior side surface of varying angulation relative to a top surface of the tibial augment.