Angled Augment Glenoid Baseplate for Bone Defect Compensation
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Solution Overview
Problem
Conventional glenoid baseplates for artificial shoulder joints struggle to stabilize and compensate for bone loss in the scapular glenoid, leading to instability and the need for excessive bone cutting during implantation.
Innovation Solution
The proposed glenoid baseplate design includes a base with a first surface on the scapular glenoid, an augment with a contact surface forming a predetermined angle with the stem's central axis, and a porous layer to promote bone growth. This design allows for stable fixation, reduced bone cutting, and easy manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional baseplate with a flat lower surface is used, then the manufacturing process is simple, but the baseplate cannot be settled or inserted stably when bone loss occurs in glenoid
Solution Approach 1:
The baseplate incorporates an augment with a contact surface formed at a predetermined angle (non-perpendicular) relative to the stem's central axis. This angular parameter change enables the baseplate to compensate for bone loss while maintaining manufacturing simplicity through the use of standard machining operations.
Solution Approach 2:
The baseplate is divided into distinct functional segments: a base portion for settling on the glenoid, an augment portion with the angled contact surface for compensating bone loss, and a stem portion for insertion. This segmentation allows each component to perform its specific function while maintaining overall manufacturability.
2Loss of substance
If the baseplate is settled on the glenoid without bone cutting, then bone preservation is maintained, but the baseplate cannot be settled on the scapula or glenoid in the portion where bone loss has occurred
Solution Approach 1:
The augment acts as an intermediary structure between the baseplate and the bone defect. It fills the gap created by bone loss and provides a stable settling surface, eliminating the need for bone cutting while ensuring reliable fixation.
Solution Approach 2:
The angled contact surface of the augment creates a mechanical interlock with the remaining bone, allowing the baseplate to settle securely without requiring removal of healthy bone tissue. The angle parameter is specifically designed to achieve this mechanical advantage.
3Reliability
If the augment is formed to compensate for bone loss, then stable fixation is achieved, but the structural complexity increases
Solution Approach 1:
The augment is merged with the baseplate as an integral component, formed in a single manufacturing process. This combination achieves the necessary structural complexity for stable fixation while avoiding the need for separate components and assembly operations.
Solution Approach 2:
The augment's contact surface is formed at a specific predetermined angle that balances fixation stability with manufacturing simplicity. This optimized parameter ensures reliable fixation without requiring overly complex structural features.
4Reliability
If the contact surface forms a predetermined angle with the stem's central axis, then bone loss compensation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
A predetermined angle is selected for the contact surface that provides effective bone loss compensation while remaining manufacturable using standard machining operations. This optimized angular parameter balances clinical effectiveness with manufacturing feasibility.
Solution Approach 2:
The angled contact surface is pre-formed during the manufacturing process rather than requiring post-processing or assembly adjustments. This preliminary formation ensures consistent angular precision while simplifying the overall manufacturing workflow.
Data Source
AI summary
A glenoid baseplate and, more specifically, to a glenoid baseplate of an artificial shoulder joint, includes: a base which is mounted on the glenoid fossa of the scapula and has a first surface; an augment disposed on the first surface; and a stem extended from the first surface while having a center axis, wherein one surface of the augment forms a contact surface with the first surface, at least a portion of the contact surface forms a predetermined angle, that is not a right angle, with respect to the center axis of the stem, and the augment includes a first wedge having a second surface extended from a first boundary and a second wedge having a third surface bent and extended from the second surface, and thus the present invention compensates for bone defects, minimizes bone cutting, and has a simple shape so as to facilitate manufacturing.