Modular Tibial Cut Guide for Knee Arthroplasty
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Solution Overview
Problem
In bi-cruciate preserving knee arthroplasty, determining proper spacing for tibial components is challenging, leading to potential wear, loosening, and increased risk of ACL tears due to mismatch or failure in maintaining joint spacing between lateral and medial compartments.
Innovation Solution
The use of cut guides that attach to the femoral component to reference medial-lateral geometry, providing sagittal and transverse captures to optimize articulation between femoral and tibial components, with adjustable mechanisms for translation and rotation to ensure accurate resections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If cut guides are used to guide tibial resections, then manufacturing precision of tibial cuts is improved, but device complexity increases
Solution Approach 1:
The cut guide is divided into separate modular components including a guide body, positioning elements, and cutting element holders that can be assembled and adjusted independently. This segmentation allows each component to be optimized for its specific function while reducing overall device complexity.
Solution Approach 2:
The cut guide incorporates pre-configured positioning features and pre-set angles that are established during manufacturing. These preliminary actions eliminate the need for complex intraoperative adjustments and measurements, simplifying the device while maintaining high precision.
2Ease of operation
If adjustable mechanisms are added to the cut guide for translation and rotation, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The cut guide incorporates movable and adjustable components that allow dynamic repositioning during surgery. Translation and rotation mechanisms enable the guide to adapt to different anatomical configurations while maintaining operational simplicity through intuitive adjustment interfaces.
Solution Approach 2:
The adjustment mechanisms allow surgeons to modify key parameters such as position, orientation, and angle of the cut guide to match patient-specific anatomy. These parameter changes are achieved through simple mechanical adjustments rather than complex computational or electronic systems.
3Reliability
If proper spacing is not maintained between tibial components, then reliability of knee function deteriorates due to wear and loosening, but surgical complexity increases to ensure proper spacing
Solution Approach 1:
The cut guide incorporates pre-calculated spacing measurements and positioning features that automatically ensure proper distance between medial and lateral tibial components. This preliminary configuration of spacing parameters eliminates the need for complex intraoperative measurements and calculations.
Solution Approach 2:
The cut guide acts as an intermediary tool that translates desired spacing parameters into precise physical positioning of the tibial components. By serving as a mechanical mediator between surgical planning and actual implant placement, it ensures proper spacing without requiring complex surgical techniques.
Data Source
AI summary
Methods and apparatuses including apparatuses that can be used for guiding resection of a tibia during a knee replacement surgery procedures are disclosed. According to one example, an apparatus for guiding a tibial bone cut during knee replacement surgery is disclosed. The apparatus can comprise a first portion and a second portion. The first portion can be configured to position the apparatus relative to one or more of a medial condyle of a femur, a lateral condyle of the femur, a medial condyle of a femoral component and a lateral condyle of the femoral component. The second portion can be connected to the first portion and can define one or more slots. The slots can be configured for at least one of a first proximal cut and a first sagittal cut to the tibia.