Modular Medial Pivot Tibial Insert Assembly for Joint Line Reconstruction
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Solution Overview
Problem
Existing endoprosthetic knee implants face challenges in accurately reconstructing the joint line due to uneven wear of tibial inserts, necessitating bone recuts and altering the patient's native joint alignment, which can lead to prolonged surgery time, increased risk of infection, and patient dissatisfaction.
Innovation Solution
A modular tibial insert assembly comprising a medial and lateral component with customizable specifications, allowing independent assessment and selection based on patient anatomy and prior implant state, enabling accurate reconstruction without extensive bone recuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standardized unitary tibial insert is used, then the implantation process is simple, but uneven wear occurs and the native joint line cannot be accurately reconstructed
Solution Approach 1:
The tibial insert is divided into a modular assembly comprising a tibial baseplate and a separate insert component that can be independently positioned. This segmentation allows the insert to be customized to match the patient's native joint line geometry while maintaining a relatively simple implantation process through modular assembly.
2Manufacturing precision
If bone recuts are performed to alter joint alignment, then the joint line can be reconstructed, but surgery time increases and infection risk rises
Solution Approach 1:
The modular insert is designed with pre-configured geometry that matches the patient's native joint line, allowing accurate reconstruction without the need for time-consuming bone recuts. The alignment is achieved through the insert design itself rather than through extensive bone preparation during surgery.
3Manufacturing precision
If bone recuts are performed to alter joint alignment, then the joint line can be reconstructed, but the amount of remaining healthy bone is reduced
Solution Approach 1:
The modular insert is pre-designed to accommodate the patient's native joint line geometry, eliminating the need for extensive bone recuts that would remove healthy bone. The solution addresses the alignment issue through the insert component rather than through bone removal.
4Reliability
If joint alignment is altered to distribute wear forces evenly, then wear distribution improves, but the patient's proprioception is altered
Solution Approach 1:
The modular insert allows for localized adjustment of the joint line geometry to match the patient's native anatomy. By preserving the native joint line position rather than altering it for uniform wear distribution, the patient's proprioception and kinesthetic sense are maintained while still achieving appropriate wear distribution through the customized insert geometry.
Data Source
AI summary
Exemplary assemblies, apparatuses, systems, methods, and kits are provided herein related to modular tibial inserts. One such assembly can comprise a modular tibial insert assembly having: a modular medial insert component, the modular medial insert component having a medial component proximal side proximally disposed from a medial component distal base side, wherein a medial component body extends between the medial component proximal side and the medial component distal base side; a modular lateral insert component, the modular lateral insert component having a lateral component proximal side proximally disposed from a lateral component distal base side, wherein a lateral component body extends between the lateral component proximal side and the lateral component distal base side; wherein the modular tibial insert assembly has an assembled configuration and a disassembled configuration, and wherein the modular medial insert component is configured to fixedly engage the modular lateral insert component in the assembled configuration.