Distal Radioulnar Joint Prosthesis for TFC Preservation
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Solution Overview
Problem
Current surgical approaches for treating distal radioulnar joint (DRUJ) instability and chronic pain, such as the Darrach, Bowers, and Sauvé-Kapandji procedures, result in compromised joint function and difficulty in accessing the DRUJ for repair without excessive damage to bone and soft tissue, and existing implants fail to accurately restore biomechanics.
Innovation Solution
A system involving methods and kits for replacing at least one surface region of the DRUJ using prostheses that include radial and ulnar prostheses, allowing for the restoration of normal biomechanics, precise placement, and minimal damage, with the prostheses designed to articulate and attach to the joint surfaces without disturbing the triangular fibrocartilage complex.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complete removal of the end of the radius and/or ulna is performed to install implants, then the joint instability and pain are addressed, but the triangular fibrocartilage complex (TFC) ligaments are compromised or removed
Solution Approach 1:
Instead of complete removal of the distal ulnar head, the invention performs partial resection of only the lateral portion (one-half to three-quarters) to expose and repair the TFC ligaments. This partial action is sufficient to access the joint and repair the ligaments while preserving the remaining ulnar head structure and its blood supply.
Solution Approach 2:
The invention extracts and repairs the damaged TFC ligaments by removing the lateral portion of the distal ulnar head, which exposes the ligaments for direct repair. The ligaments are then reconstructed and fixed to the remaining ulnar head and radius, restoring their function without requiring complete bone removal.
2Object-affected harmful factors
If conservative resection of the distal ulnar head is performed, then bone and soft tissue damage is reduced, but DRUJ function is abolished
Solution Approach 1:
The invention performs partial resection of the distal ulnar head to expose the TFC ligaments for repair, then reconstructs and fixes the ligaments to restore DRUJ function. This partial action approach allows preservation of the remaining ulnar head while achieving ligament repair, avoiding both complete removal and total function loss.
Solution Approach 2:
The invention uses the remaining distal ulnar head as an intermediary structure to which the repaired TFC ligaments can be attached. The ulnar head serves as a mediator between the radius and the hand, providing a stable anchor point for ligament reconstruction while preserving wrist function.
3Reliability
If existing DRUJ implants are used, then joint replacement is attempted, but the design is constrained and cannot sufficiently restore biomechanics
Solution Approach 1:
Instead of using conventional implants that replace the entire joint, the invention extracts and repairs the specific damaged TFC ligaments through partial resection of the distal ulnar head. This targeted approach restores the natural ligamentous biomechanics rather than relying on constrained implant designs.
Solution Approach 2:
The invention uses the patient's own remaining distal ulnar head as a self-service structure to anchor the repaired TFC ligaments. The natural bone and ligamentous structures are utilized to restore biomechanics, eliminating the need for externally constrained implant designs.
Data Source
AI summary
System, including methods, apparatus, and kits, for replacement of at least one surface region of a distal radioulnar joint using at least one prosthesis. In some embodiments, the system may provide restoration of normal, unconstrained biomechanics of the joint, which may preserve rotation and translation and ensure durability of the joint.