Modular Knee Prosthesis Spacer for Alignment Correction
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Solution Overview
Problem
In knee arthroplasty, improper osteotomy can lead to imbalanced spacing between the femur and tibia, causing lower extremity alignment issues, posterior inclination, and imbalanced flexion-extension gaps due to the lack of a correct reference standard for positioning during surgery.
Innovation Solution
A knee prosthesis with a tibial insert and tibial tray system that includes spacers and a clamping mechanism to stabilize and adjust the alignment, allowing for replacement of spacers to correct knee joint inclination without the need for additional osteotomy, thereby improving connection stability and facilitating pain reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional tibial insert products are used, then the basic knee replacement function is achieved, but lower extremity alignment varus and valgus, large posterior inclination of tibia and imbalanced flexion-extension gap occur after surgery
Solution Approach 1:
The tibial insert is segmented into a modular structure comprising a base plate, spacers, and a tibial component. The spacers are positioned between the base plate and tibial component to precisely control the alignment and spacing, enabling accurate positioning without requiring perfect osteotomy. This segmentation allows independent adjustment of each component to achieve proper alignment.
Solution Approach 2:
The invention introduces adjustable parameters through multiple spacers of different thicknesses and configurations. By selecting and positioning specific spacers, the surgeon can adjust the flexion-extension gap balance, correct varus/valgus alignment, and control posterior tibial inclination. These parameter changes compensate for osteotomy errors and achieve precise alignment.
2Productivity
If improper osteotomy is performed due to lack of reference standard, then surgery can be completed, but imbalanced spacing between femur and tibia occurs requiring additional corrective procedures
Solution Approach 1:
The modular tibial insert with pre-configured spacers serves as a preliminary alignment tool during surgery. The spacers are positioned on the base plate before final assembly, allowing the surgeon to establish correct alignment and spacing early in the procedure. This preliminary action prevents the need for complex corrective osteotomies later.
Solution Approach 2:
The spacers act as intermediary elements between the base plate and tibial component, mediating the alignment relationship. These spacers provide a reference standard for positioning, enabling the surgeon to achieve proper spacing and alignment without relying on perfect osteotomy. The intermediaries simplify the surgical procedure and reduce the need for corrective operations.
3Stability of the object's composition
If the tibial insert uses a fixed structure, then the initial alignment is established, but the ability to correct inclination errors is lost
Solution Approach 1:
The tibial insert employs a dynamic modular design where spacers can be selectively positioned, added, or removed based on the patient's specific alignment needs. This dynamic configuration allows the structure to adapt to different correction requirements while maintaining overall stability. The modular components can be assembled in various arrangements to correct different types and degrees of inclination errors.
Solution Approach 2:
Different regions of the tibial insert have specialized functions: the base plate provides stable anchoring to the tibia, the spacers provide adjustable spacing and alignment control in specific locations, and the tibial component provides the articulating surface. This local differentiation of quality allows the structure to be both stable and adaptable, with each region optimized for its specific function.
Data Source
AI summary
Disclosed is a knee prosthesis for error correction and a use method thereof, belonging to the technical field of knee prostheses. A knee prosthesis for error correction includes a tibial insert and a tibia tray. The tibial insert is arranged on the tibia tray, and includes a first spacer, a second spacer and a supporting spacer. The first spacer and the second spacer are respectively located on both sides of the supporting spacer and spliced to form a whole spacer. The whole spacer is provided with an anti-falling piece, and the whole spacer is clamped with a tibia tray platform. The supporting spacer is provided with a connecting piece, and the supporting spacer is respectively connected to the first spacer and the second spacer through the connecting piece. According to the present disclosure, the problem of imbalanced spacing between femur and tibia after surgery caused by improper osteotomy is improved.