Hinged Orthopaedic Prosthesis Intraoperative Assembly
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Solution Overview
Problem
Constrained orthopaedic knee prostheses often require additional bone or tissue removal for assembly, limiting their applicability and increasing surgical complexity.
Innovation Solution
A hinged orthopaedic prosthesis design featuring a tibial tray, tibial insert, hinge component, and femoral component, where the hinge component's elongated shaft and movable hinge arms allow for intraoperative assembly without the need for additional bone or tissue removal, facilitating posterior movement of the femoral component during flexion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constrained orthopaedic knee prostheses are designed with fixed mobility, then joint stability is improved, but surgical complexity and tissue removal increase
Solution Approach 1:
The hinge component is divided into separate modular parts including the elongated shaft, hinge arms, and axles that can be independently positioned and assembled. This segmentation allows the components to be inserted through existing passageways without requiring additional bone removal, thereby maintaining joint stability while reducing surgical complexity
Solution Approach 2:
The hinge component parts are designed to be nested within existing passageways of the tibial tray and femoral component. The elongated shaft fits through the tibial tray passageway, while hinge arms and axles are received within the intercondylar compartment, allowing assembly without additional tissue removal
2Ease of manufacture
If hinge component parts are made separate for modular assembly, then ease of assembly is improved, but device complexity increases
Solution Approach 1:
Multiple hinge component parts including the elongated shaft, hinge arms, and axles are combined into a single integrated assembly that functions as one unit. This merging allows the components to be pre-assembled and implanted together through existing passageways, simplifying the surgical procedure while maintaining the benefits of modular design
3Ease of manufacture
If additional bone or tissue removal is performed for assembly, then ease of assembly is improved, but loss of substance increases
Solution Approach 1:
The hinge component is designed to be assembled and positioned within the intercondylar compartment before final implantation. The elongated shaft is inserted through the tibial tray passageway and the hinge arms are positioned within the intercondylar compartment through preliminary positioning, allowing assembly without additional bone removal during the surgical procedure
Data Source
AI summary
An orthopaedic prosthesis includes a tibial tray, a tibial insert configured to be coupled to the tibial tray, a hinge component configured to be received in a passageway of the tibial tray, and a femoral component configured to articular with the tibial insert. The hinge component includes a pair of hinge arms, each of which includes an axle extending therefrom that is configured to be received in an aperture of a corresponding sidewall of an intercondylar compartment of the femoral component. The axles of the hinge arms may be coaxial or non-coaxial. Additionally, each axle may be coaxial with or offset from a center of a constant radius of curvature that defines an articular surface of a corresponding condyle of the femoral component. The axles may have an outer surface of various shapes depending on the embodiment.