Modular Elbow Prosthesis for Canine Joint Replacement
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Solution Overview
Problem
Current elbow arthroplasty techniques for canines are inadequate due to high failure rates and inability to address the unique anatomy of the canine elbow joint, which consists of three compartments, leading to constrained movement and early implant fixation failure.
Innovation Solution
A modular, nonconstrained elbow prosthesis system that allows for partial or total replacement of the elbow joint, specifically designed to address the medial and lateral compartments, using a combination of metal and polyethylene components with conical and ring geometries to mimic natural joint movement, along with a minimally invasive surgical approach.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If constrained or semiconstrained bicompartmental total elbow replacements are used, then the prosthesis provides structural stability, but the natural anatomical movement between the radius and ulna is constrained leading to early implant fixation failure
Solution Approach 1:
The prosthesis is divided into separate modular components: a humeral component, a radial component, and an ulnar component. Each component can be independently positioned and adjusted to restore natural anatomical relationships while maintaining structural stability. The segmentation allows the radius and ulna to move independently as they would in a natural joint.
Solution Approach 2:
The prosthesis design incorporates dynamic positioning capabilities that allow the radial and ulnar components to move relative to each other during elbow motion. This dynamic configuration restores the natural kinematics of the elbow joint, including pronation and supination movements, while maintaining implant stability through precise modular alignment.
2Reliability
If unicompartmental knee replacements are performed, then the success rate is high and recovery is quick, but there is no equivalent solution for the canine elbow joint
Solution Approach 1:
The elbow joint is divided into three compartments (humeroradial, humeroulnar, and radioulnar) that can be addressed independently or in combination. This segmentation allows for unicompartmental, bicompartmental, or tricompartmental replacement options, providing versatility similar to unicompartmental knee replacements while adapting to the specific anatomy and pathology of the canine elbow.
Solution Approach 2:
The modular prosthesis system is designed to be universally applicable to various elbow pathologies and anatomical configurations. The same basic component set can be configured for different replacement extents (unicompartmental, bicompartmental, or total elbow arthroplasty) and can accommodate variations in bone quality, joint alignment, and patient-specific requirements.
3Reliability
If complex interconnected prostheses are used for elbow replacement, then the joint structure is replaced, but the implantation process becomes complex requiring precise removal of large bone portions and damage to ligaments
Solution Approach 1:
The prosthesis is composed of separate modular components that can be implanted in a staged or single-stage procedure with reduced bone removal. The humeral, radial, and ulnar components can be positioned independently, allowing for more conservative bone preparation compared to monoblock designs. This segmentation reduces the need for extensive bone resection and ligament damage.
Solution Approach 2:
The modular components are designed with pre-configured alignment features and attachment mechanisms that simplify the implantation process. The components can be pre-assembled or pre-positioned relative to each other, reducing the precision requirements during surgery compared to complex interconnected designs. This preliminary configuration reduces surgical time and complexity while maintaining joint function.
Data Source
AI summary
A modular elbow prosthesis is disclosed, as well as a surgical approach and implantation technique, for using the prosthesis. The system is the first and only to allow for a, Biomechanically Anatomical, Nonconstrained, Compartmental (BANC) Elbow Arthroplasty. The modularity of the system allows it to be implanted as an unicompartmental or partial elbow replacement or a total elbow replacement. The modular elbow prosthesis for partial elbow replacement includes a cylindrical medial humeral component, a polyethylene ring thereon, and a semicircular medial ulnar component which mates with the polyethylene ring. Additionally, for total elbow replacement, the modular elbow prosthesis also includes a circular lateral humeral component, a polyethylene ring thereon, a semicircular lateral ulnar component, and a radial component. Implantation of the prosthesis is through a minimally invasive medial surgical approach with the aid of precision biomechanical guides. The application is well suited for canines, other quadrupeds, and people.