Pegless Glenoid Prosthesis Baseplate for Bone-Preserving Fixation
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Solution Overview
Problem
Existing glenoid prosthesis designs with central pegs transmit forces to deeper bone layers, leading to potential bone degradation and fracture, require significant bone removal, and risk cortical perforation, compromising stability and future surgical options.
Innovation Solution
A pegless glenoid prosthesis baseplate design with mounting tabs and through holes, secured by screws or rivets, fixes to the glenoid rim, reducing force transmission to deeper bone layers and eliminating the need for extensive bone removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a large central peg is used to neutralize eccentric pressing forces, then force neutralization is improved, but bone mass removal increases and cortical perforation risk increases
Solution Approach 1:
The baseplate is divided into multiple mounting tabs distributed around the periphery, each with its own through hole for independent screw fixation. This segments the fixation function across multiple points rather than relying on a single central peg, reducing the need for extensive bone removal while maintaining force neutralization capability.
Solution Approach 2:
The central peg is completely removed from the design. Instead of using a large central peg to absorb eccentric forces, the invention extracts this function and redistributes it across multiple peripheral mounting tabs, thereby eliminating the need for significant bone mass removal and avoiding cortical perforation risks.
2Force
If a large central peg is sunk into the glenoid, then force absorption is improved, but bone degradation increases
Solution Approach 1:
The central peg that transmits forces to deep bone layers is extracted and replaced with peripheral mounting tabs. This removes the harmful force transmission pathway while maintaining the necessary force absorption and neutralization functions at the periphery, thereby preventing bone degradation in the glenoid stock.
Solution Approach 2:
The force absorption function is segmented across multiple peripheral mounting tabs rather than concentrated in a single central peg. This distribution reduces the stress on any single bone area and eliminates the deep force transmission that causes bone degradation, while maintaining overall force absorption capability.
3Stability of the object's composition
If a central peg is used for fixation, then stability is improved, but cortical perforation risk increases
Solution Approach 1:
The fixation function is segmented across multiple peripheral mounting tabs with individual through holes, allowing distributed screw insertion. This segmentation approach provides stable fixation while avoiding the cortical perforation risk associated with large central pegs that require deep bone penetration.
Solution Approach 2:
The central peg design that inherently risks cortical perforation is extracted and replaced with peripheral mounting tabs. These tabs provide equivalent or superior fixation stability through distributed mechanical anchoring while eliminating the need for deep bone penetration and avoiding cortical damage.
4Ease of manufacture
If significant bone mass is removed for peg insertion, then peg insertion is enabled, but future surgical options are compromised
Solution Approach 1:
The central peg design that requires significant bone mass removal is extracted and replaced with peripheral mounting tabs. This extraction eliminates the need for extensive bone resection, preserving glenoid bone stock and maintaining future surgical options while still enabling secure prosthesis fixation.
Solution Approach 2:
The fixation mechanism is segmented into multiple small peripheral mounting tabs rather than requiring a large central peg. This segmentation allows for minimal bone intervention and preserves bone architecture, thereby maintaining adaptability for future surgical interventions while achieving reliable current fixation.
Data Source
AI summary
The invention discloses a glenoid prosthesis baseplate, having a surface (1) for an artificial socket insert, an opposite fitting surface (2), and holes (2f) passing through the surfaces (1, 2), and feet (3) on the surface (1) for the artificial socket insert for fixing the artificial socket insert. The baseplate has at least two mounting tabs (4) connected to the edge (P) of the baseplate, and holes (4a) passing through each mounting tab (4), and the prosthesis baseplate is provided with at least two through holes (2f) passing through both the surface (1) for the artificial socket insert and the fitting surface (2), and each hole (2f) being in alignment with the axis of a through hole (4a) of the mounting tab (4).