All-Metal Glenoid Component for Posterior Bone Erosion Fixation
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Solution Overview
Problem
Existing shoulder replacement devices fail to prevent or exacerbate posterior bone erosion, reducing the effectiveness of total shoulder arthroplasty due to bone loss, even with bone grafts.
Innovation Solution
A glenoid component with a convex first surface, concave second surface, and a channel for a bone engagement member, along with alignment members, is designed to secure the component to the shoulder bone, using an all-metal construction to enhance fixation and prevent posterior bone erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a plastic augmented glenoid component with bone graft is used, then bone loss can be addressed, but posterior bone erosion still occurs reducing effectiveness
Solution Approach 1:
The patent changes the material parameter from plastic to metal (cobalt chrome or titanium alloy), and changes the fixation method parameter from cemented to press-fit with bone engagement members. This material and fixation method transformation provides superior mechanical strength and durability, preventing posterior bone erosion while maintaining bone loss management, thereby resolving the contradiction between addressing bone loss and ensuring long-term effectiveness.
Solution Approach 2:
The glenoid component utilizes composite construction combining metal materials (cobalt chrome or titanium alloy) with integrated bone engagement members. This composite approach integrates multiple functions: the metal body provides structural strength and wear resistance, while the integrated bone engagement members provide secure fixation. This resolves the contradiction by creating a unified structure that simultaneously manages bone loss and prevents erosion.
2Ease of operation
If conventional glenoid components are used, then shoulder joint can be replaced, but humeral head dislocation occurs
Solution Approach 1:
The concave second surface of the glenoid component is designed with a spherical curvature that articulates with the humeral head. This spherical geometry provides optimal contact area and mechanical interlocking, preventing humeral head dislocation while maintaining smooth joint motion. The curved surface design resolves the contradiction between ease of replacement and dislocation prevention.
3Device complexity
If the channel axis is perpendicular to the first surface, then alignment is simplified, but optimal bone engagement and alignment are compromised
Solution Approach 1:
The channel axis is angled relative to the first surface rather than being perpendicular, creating a localized geometric feature that optimizes bone engagement. This angled configuration allows bone engagement members to be inserted at an optimal angle for maximum fixation strength and proper alignment with the shoulder bone anatomy. The angled channel design resolves the contradiction by prioritizing alignment precision over simplification.
Data Source
AI summary
A glenoid component includes a body, a first, convex surface, a second, concave surface, a third surface connecting the first and second surfaces, a channel, and at least one alignment member. The channel extends from a first channel opening of the first surface through the body to a second channel opening defined on the third surface and has a channel axis extending through the first and second channel openings. The channel axis intersects a first plane defined by the first channel opening at an angle transverse to the first plane. The channel is configured to receive a bone engagement member to attach the body to a shoulder bone. The at least one alignment member extends from the first surface to align the body to the shoulder bone. The bone engagement member can attach the body to the shoulder bone.