Segmented Radial Glenoid Prosthesis With Angular Offset
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Solution Overview
Problem
Current prosthetic solutions for treating articular pathologies of the distal radius often sacrifice bone stock and cartilage, and lack effective means to repair or reconstruct the articular surface, especially in cases of fractures with accompanying articular surface lesions.
Innovation Solution
A prosthetic material comprising a plate with an angularly offset extension and an attached articular plate that reproduces the radial glenoid surface, featuring a slide structure and locking mechanisms for secure fixation, allowing for reduced trauma and effective repair of the damaged articular surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional prostheses are used to treat articular pathologies of the distal radius, then the prosthesis can be installed to replace damaged bone, but bone stock and cartilage are sacrificed
Solution Approach 1:
The prosthesis is divided into two separate components: a fixation plate that attaches to the radius and an articular surface component that replaces the radial glenoid. This segmentation allows the fixation plate to secure the prosthesis while the articular component restores the joint surface, avoiding the need to sacrifice healthy bone stock for overall fixation.
Solution Approach 2:
The damaged radial glenoid portion is resected and replaced by the articular surface component, while the healthy bone stock of the radius is preserved by attaching the fixation plate to the intact cortical bone. This extraction of only the damaged portion rather than sacrificing the entire bone structure resolves the contradiction.
2Reliability
If conventional prostheses are used to treat articular pathologies, then the prosthesis can be installed, but cartilage of the first row of the carpus is sacrificed
Solution Approach 1:
The articular surface component is specifically designed with a contoured surface that reproduces the radial glenoid anatomy, providing localized cartilage replacement only where the radial glenoid is damaged. This localized approach preserves the cartilage of the first row of the carpus that would otherwise be sacrificed by conventional prostheses.
3Strength
If screws or pins are used to repair fractures of the distal radius, then the fracture can be fixed, but articular surface lesions cannot be effectively repaired or reconstructed
Solution Approach 1:
The prosthesis combines fracture fixation functionality with articular surface reconstruction in a single integrated solution. The fixation plate provides fracture stabilization through screw fixation, while the attached articular surface component simultaneously reconstructs the radial glenoid, addressing both fracture fixation and articular surface repair needs.
4Reliability
If a complex prosthetic structure is designed to replace the radial glenoid, then articular surface reconstruction is achieved, but the installation becomes difficult in the confined operating field
Solution Approach 1:
The prosthetic structure is segmented into a fixation plate and an articular surface component that can be assembled separately and then joined together. This segmentation allows each component to be prepared independently and facilitates easier manipulation and installation in the confined wrist operating field compared to a single complex monolithic structure.
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to prosthetic material for replacing at least one portion of the radial glenoid of a radius, which includes a prosthetic structure (1') made up of a plate (2) extended by an end piece (3), and a set of screws (4) for attaching the plate (2) to the receiving bone matter (R). The plate (2) is made up of a planar body (7) extended by a one-piece head (8), said plate head (8) being extended in turn by means of an extension (5) (forming one portion of the end piece (3)) with an inner surface (5') extending in a general plane (D) which is angularly offset relative to the plane (P) of said plate body (7). Said extension (5) engages with an added plate (6) (forming the other portion of the end piece (3)), of which the outer surface (3') at least approximately reproduces at least one portion of the surface of the radial glenoid of the radius, and the supporting extension (5) and the added plate (6) are provided with a means for rigid connection which includes: (i) a structure of slides (11, 13) arranged, on the one hand, on said plate (6) and, on the other hand, on said extension (5), and (ii) a means (14, 15) for attaching said plate (6) in the correct position on said extension (5).