Metaglene Augment Preserves Bone Stock in Shoulder Arthroplasty
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Solution Overview
Problem
Current treatments for rotator cuff deficient shoulders with glenoid erosion or defects often require asymmetric bone preparation, bone grafts, or two-stage surgical procedures, which can lead to complications and inadequate conservation of healthy bone stock.
Innovation Solution
A metaglene assembly for shoulder prostheses featuring a metaglene body with an augment and void, along with fastener holes and fasteners, designed to be implanted based on specific bone defects, allowing for customizable fit and fixation without the need for bone grafts or two-stage surgeries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If asymmetric bone preparation is used to create support for metaglene component, then proper support surface is achieved, but healthy bone stock is sacrificed
Solution Approach 1:
The metaglene component incorporates an augment with variable thickness that provides localized additional support precisely where glenoid erosion or defects exist. This allows the implant to adapt to the specific defect location and extent without requiring asymmetric removal of healthy bone throughout the glenoid, thereby maintaining bone stock while achieving stable support.
Solution Approach 2:
The metaglene component is pre-configured with an augment of specific thickness and geometry before implantation. This preliminary configuration allows the component to be inserted as a complete unit that immediately provides the necessary support augmentation, eliminating the need for intraoperative asymmetric bone preparation and preserving healthy bone stock.
2Stability of the object's composition
If bone graft is used to fill eroded or defected area, then adequate support is provided, but complications from graft non-union occur
Solution Approach 1:
The invention extracts the bone grafting step entirely from the surgical procedure. Instead of using separate bone graft material that requires healing and union, the metaglene component integrates the augment as a permanent structural feature of the implant itself, providing immediate and reliable support without graft non-union complications.
Solution Approach 2:
The metaglene component merges the glenoid implant with the augment into a single integrated unit. The augment is incorporated directly into the metaglene component structure, combining the functions of joint replacement and defect reconstruction into one reliable implant that eliminates the need for separate bone grafting procedures.
3Object-affected harmful factors
If interposition shoulder arthroplasty is performed, then pain is eased and temporary function is restored, but two-stage surgery is required
Solution Approach 1:
The metaglene component merges definitive joint reconstruction with defect correction into a single surgical procedure. The implant simultaneously restores the shoulder joint surface and provides structural support for eroded or defected glenoid bone, eliminating the need for separate interposition arthroplasty and subsequent reconstruction surgeries.
Solution Approach 2:
The metaglene component serves multiple functions in a single implant: it replaces the damaged joint surface, provides structural support for defective bone, and restores shoulder function. This multi-functionality allows one surgical procedure to address both pain relief and long-term structural integrity, avoiding the need for staged procedures.
Data Source
AI summary
A method of implanting a glenoid component includes selecting a metaglene component having a body portion and an augment extending medially from the body based upon a defect in a scapula, inserting the selected metaglene component into the scapula, inserting a portion of a first fastener through a body fastener hole of the body portion into a void defined by the body portion and a portion of the augment, inserting the portion of the first fastener into a first augment fastener hole extending through the augment and aligned with the body fastener hole, and inserting the portion of the first fastener into the scapula.