Glenoid Baseplate Wedge Design for Axis Correction
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Solution Overview
Problem
Conventional glenoid baseplates face challenges in stable insertion and bone cutting minimization due to bone loss and twisted insertion axes, leading to inadequate surgical outcomes and potential aftereffects.
Innovation Solution
A glenoid baseplate design featuring a base with an augment and stem, where the augment includes a plate and wedge structure that gradually decreases in thickness, forming a convex surface to correct the insertion axis, and a porous layer for bone growth, along with a reinforcement member for strength and weight reduction, integrated to minimize processing and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flat baseplate is used, then the structure is simple and easy to manufacture, but the baseplate cannot be stably inserted when the glenoid protrudes due to bone loss, and unnecessary bone cutting is required
Solution Approach 1:
The baseplate incorporates a wedge section with gradually varying thickness at the lower portion, creating local structural variation. This wedge section has a first thickness at the proximal end that gradually decreases to a second thickness at the distal end, allowing the baseplate to adapt to protruding glenoid surfaces caused by bone loss while maintaining overall structural integrity
Solution Approach 2:
The invention transitions from a conventional flat two-dimensional baseplate to a three-dimensional structure with a wedge section that adds vertical dimensionality. The wedge section creates a tapered profile that enables the baseplate to compensate for bone loss by adjusting to varying glenoid depths, eliminating the need for unnecessary bone cutting
2Loss of substance
If bone cutting is minimized to preserve bone structure, then bone loss is reduced, but the insertion axis of the baseplate becomes twisted due to the shape of the glenoid
Solution Approach 1:
The wedge section modifies the thickness parameter of the baseplate in a controlled manner, with the thickness gradually changing from the proximal to distal end. This parameter variation allows the baseplate to self-align with the glenoid surface, correcting the insertion axis without requiring additional bone cutting or structural modification
3Reliability
If the baseplate is designed to accommodate bone loss and correct insertion axis, then surgical outcomes are improved, but the baseplate structure becomes more complex
Solution Approach 1:
The wedge section is integrated as a single continuous structure with the baseplate body, merging the compensation function and alignment correction function into one unified component. This integration eliminates the need for separate adjustment pieces or modular components, simplifying the manufacturing process while achieving multiple functional goals
Data Source
AI summary
A glenoid baseplate and, more specifically, to a glenoid baseplate of an artificial shoulder joint, includes: a base seated on the glenoid cavity of the scapula; an augment formed on one surface of the base; and a stem extending from the base to one side while having a central axis, wherein the augment comprises a plate having a second surface extending from one end of the plate in one direction. The plate extends from one end of the base through the central axis to a point spaced apart by a first length from the central axis, and the wedge extends from one end of the plate in a first direction such that the thickness thereof gradually decreases. Accordingly, it is possible to minimize bone cutting and correct an insertion axis of the baseplate.