Ankle Prosthesis Porous Fixation for Tibia Stability
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Solution Overview
Problem
Current ankle replacement systems face challenges in achieving reliable fixation to the distal tibia, leading to potential instability and reduced effectiveness in alleviating pain and improving joint function.
Innovation Solution
A prosthesis design featuring a body with spaced apart rails forming a channel, a stem extending upwardly, and fixation elements such as pegs and prongs with frictional elements, which are configured to securely engage the bone, promoting bony ingrowth and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ankle replacement systems are used, then the basic joint replacement function is provided, but reliable fixation to the distal tibia is not achieved
Solution Approach 1:
The prosthesis incorporates porous coating on its surface, particularly on the distal portion that contacts the distal tibia. This porous structure provides mechanical interlocking with the bone tissue, allowing bony ingrowth into the porous regions, thereby significantly enhancing fixation reliability and attachment strength without requiring excessive cement or additional fixation components.
2Stability of the object's composition
If fixation elements are added to improve stability, then attachment strength increases, but device complexity increases
Solution Approach 1:
The prosthesis design merges the fixation function directly into the main body structure by integrating porous coating regions and geometric interlocking features into the distal tibia-contacting portion. This eliminates the need for separate, complex fixation elements while achieving stable attachment through the combined effect of porous surface areas and structural geometry, thereby maintaining simplicity.
3Ease of operation
If the prosthesis profile is reduced for minimally invasive surgery, then ease of operation improves, but fixation capability may be compromised
Solution Approach 1:
The prosthesis employs local quality by concentrating the fixation-enhancing features (porous coating, geometric interlocking structures) specifically in the distal portion that contacts the distal tibia, while keeping the proximal and intermediate portions streamlined for easy insertion. This localized approach ensures reliable fixation is achieved at the critical interface without requiring a bulky overall profile, thus maintaining ease of operation for minimally invasive surgery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The described prosthesis provides enhanced fixation and stability to the ankle joint, improving the range of motion and reducing pain by securely attaching to the bone, thus enhancing the overall quality of life for patients.
Implementation Method 1
fixation elements such as pegs and prongs with frictional elements, which are configured to securely engage the bone
Data Source
AI summary
A system includes a first prosthesis. The first prosthesis may include a body extending along a length from a first side to a second and including a third side disposed between the first side and the second side. The body may include a pair of spaced apart rails between which a channel is defined. A stem and a first fixation element may extend upwardly from the third side. A method may include coupling the first prosthesis to bone.