Modular Knee Prosthesis Augments for Bone Loss
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Solution Overview
Problem
Current knee joint prostheses face challenges in providing adequate stability and accommodating bone loss during revision procedures, particularly in cases where existing prostheses need to be replaced due to damage or deterioration, and require customization to match individual patient needs.
Innovation Solution
The development of a modular knee joint prosthesis system that includes interchangeable tibial and femoral components, stems, adapters, and augments, allowing for various configurations such as crutiate retaining, posterior stabilized, fully constrained, and hinged knee prostheses, with adjustable offsets and Morse-type taper fits for secure attachment, enabling intra-operative selection to suit specific patient requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a modular prosthesis system with multiple components is used, then adaptability and versatility are improved, but device complexity increases
Solution Approach 1:
The prosthesis system is divided into multiple modular components including femoral components, tibial components, stems, adapters, and augments. Each component can be independently selected and combined to match specific patient needs, allowing customization while managing complexity through standardized interfaces and modular architecture.
2Adaptability or versatility
If customized configurations are selected intra-operatively, then adaptability is improved, but loss of time occurs
Solution Approach 1:
Multiple pre-designed component variants with different geometries, offsets, and configurations are prepared in advance as part of the modular system. Surgeons can select from pre-engineered options during surgery rather than customizing components intra-operatively, reducing decision time while maintaining adaptability to patient-specific requirements.
3Strength
If Morse-type taper fits are used for attachment, then strength is improved, but manufacturing precision requirements increase
Solution Approach 1:
The Morse-type taper interface utilizes specific geometric parameters including taper angle, diameter ratios, and surface finish specifications to achieve both high connection strength and manufacturing feasibility. The standardized taper dimensions balance the need for strong mechanical attachment with practical manufacturing tolerances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This modular system provides enhanced stability and adaptability, allowing surgeons to customize knee joint prostheses during procedures to address bone loss and individual patient needs, ensuring optimal fit and function while minimizing bone removal.
Implementation Method 1
Morse-type taper fits for secure attachment
Implementation Method 2
The female tapered receiving portion can cooperatively engage the male tapered insertion portion by way of a Morse-type taper fit
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A modular knee prosthesis can include a femoral component (112) haying a superiorly extending portion (130), a first femoral bearing surface (114) and a second femoral bearing surface (116). The superiorly extending portion can define a first tapered augment receiving surface (132). A tibial component (12) can have an interiorly extending portion (28) and a tibial bearing surface. The interiorly extending portion can define a second tapered augment receiving surface (30). A first augment (400) can define a first receiving bore and a first stepped surface. A second augment (402) can define a second receiving bore and a second stepped surface. The first and second augments are adapted to mate at the first and second stepped surfaces in a first portion at the first tapered augment receiving surface of the femoral component and in a second position at the second tapered augment receiving surface of the tibial component.