Femoral Component Bone Compacting Ridge Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current knee prostheses often require significant bone resection and can impinge on adjacent soft tissues, limiting flexibility and compatibility with varying patient anatomies.
Innovation Solution
The development of a femoral component with bulbous posterior geometry, 'standard' and 'narrow' designs sharing a common bone-resection profile, and features like a lateral posterior condyle, anterior flange, and intercondylar notch to minimize bone removal and soft tissue impact, facilitating deep flexion and external rotation while avoiding impingement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional femoral component geometry is used, then adequate articulation is achieved, but significant bone resection is required and soft tissue impingement occurs
Solution Approach 1:
The femoral component is divided into multiple condyles (medial and lateral condyles) with distinct geometric characteristics. Each condyle is segmented to perform specific functions: the medial condyle provides weight-bearing articulation while the lateral condyle facilitates rotation and flexion, allowing optimized bone resection at each location rather than uniform resection throughout
Solution Approach 2:
The patent introduces a new geometric dimension by creating a bulbous posterior condylar region that extends posteriorly beyond the traditional articular surface. This posterior extension in the sagittal dimension enables deep flexion and external rotation without requiring increased anterior bone resection, effectively adding functional capability without proportional loss of bone stock
2Reliability
If traditional femoral component geometry is used, then adequate articulation is achieved, but soft tissue impingement occurs
Solution Approach 1:
Different regions of the femoral component are assigned different geometric qualities: the anterior flange has a specific curvature to accommodate patellar tracking, the condyles have bulbous posterior regions for deep flexion, and the lateral condyle is shortened to prevent impingement. Each local region is optimized for its specific function while minimizing harm to adjacent soft tissues
Solution Approach 2:
The femoral component employs asymmetric geometry where the lateral condyle is deliberately made shorter than the medial condyle in the proximal-distal dimension. This asymmetry facilitates external rotation during flexion while preventing impingement between the lateral condyle and surrounding soft tissues, a design choice that would be impossible in a symmetric traditional component
3Ease of manufacture
If fixed femoral component design is used, then manufacturing is simplified, but adaptability to varying patient anatomies is limited
Solution Approach 1:
The femoral component incorporates dynamic geometric features that adapt to different patient anatomies through a size series. While maintaining a consistent bulbous posterior geometry pattern, the component offers multiple size options with varying condylar dimensions, allowing the same design family to adapt to different patient requirements without requiring fundamentally different designs for each patient type
Data Source
AI summary
An orthopedic knee prosthesis includes a femoral component which exhibits enhanced articular features, minimizes removal of healthy bone stock front the distal femur, and minimizes the impact of the prosthesis on adjacent soft tissues of the knee.