Modular Glenoid Prosthesis Augments for Bone Loss Fixation
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Solution Overview
Problem
Existing reverse shoulder arthroplasty (rTSA) designs face challenges in achieving initial glenoid fixation, joint stability, and function, particularly in cases of severe glenoid wear, glenoid/scapula fractures, and aseptic glenoid loosening due to insufficient initial fixation.
Innovation Solution
A reverse shoulder glenoid prosthesis with modular attachments that provide additional scapular fixation, joint line lateralization, containment of glenoid bone grafts, and reconstruction of scapular bone, while also improving rTSA joint biomechanics by altering the line of action of rotator cuff muscles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional uncemented glenoid components are used, then the device complexity is reduced, but the initial fixation strength is insufficient leading to aseptic glenoid loosening
Solution Approach 1:
The glenoid component is divided into modular segments including a baseplate and detachable augments that can be selectively attached. This segmentation allows the surgeon to customize the fixation approach for each patient's specific bone quality and defect type, thereby improving initial fixation strength without requiring a completely complex integrated design.
Solution Approach 2:
The baseplate is designed with universal features including multiple attachment options for different augment types (medial, lateral, superior, inferior), various fixation methods (screws, plates, grafts), and adaptable configurations for different bone conditions. This multi-functionality allows a single baseplate design to address diverse fixation challenges, improving initial fixation strength across multiple scenarios.
2Reliability
If additional fixation methods and modular attachments are added, then the reliability of glenoid fixation is improved, but the device complexity increases
Solution Approach 1:
The modular attachment system allows dynamic adaptation during surgery. The surgeon can select and attach only the specific augments and fixation methods needed for each patient's condition, rather than having all options permanently integrated. This dynamic configurability improves fixation reliability for each specific case while keeping the overall system manageable in complexity.
Solution Approach 2:
The modular augments are designed to nest onto the baseplate in a hierarchical manner, with each augment type providing specific fixation functions. This nested structure allows multiple fixation mechanisms to be combined in a organized, space-efficient way that improves reliability without creating excessive device complexity.
3Adaptability or versatility
If the prosthesis is designed to accommodate severe bone loss and fractures, then the adaptability is improved, but the ease of operation deteriorates due to complex surgical procedures
Solution Approach 1:
The modular design allows the surgeon to address bone loss and fractures by selectively attaching specific augments (medial, lateral, superior, inferior) to the baseplate. Each augment can be independently selected and positioned based on the specific defect location, improving adaptability while maintaining surgical simplicity through a systematic, step-by-step attachment process.
Solution Approach 2:
The baseplate is designed to be implanted first, establishing a stable foundation before any augments are attached. This preliminary action simplifies the overall procedure by creating a standardized starting point from which various bone loss scenarios can be systematically addressed, improving both adaptability and ease of operation.
4Ease of repair
If modular attachments are used to provide additional fixation and reconstruction, then the manufacturing precision requirements increase, but the ease of repair and customization improve
Solution Approach 1:
The baseplate incorporates universal attachment interfaces that can accommodate multiple types of augments through standardized connection mechanisms. This universality improves ease of customization and repair by allowing interchangeable components, while the manufacturing precision is concentrated in the standardized interface design rather than requiring unique precision for each component combination.
Data Source
AI summary
In some embodiments, the present invention provides a reverse shoulder glenoid prosthesis which supports the attachment of multiple different types of modular attachments that can: 1) provide additional scapular fixation (ie external to the glenoid) in order to improve glenoid implant fixation in cases of severe bone loss/fracture, 2) provide joint line lateralization to improve tissue stability in cases of severe glenoid/scapula bone loss, 3) facilitate use and containment of glenoid bone graft in cases of severe glenoid/scapula bone loss—particularly in those cases in which the glenoid defect is uncontained/peripheral 4) achieve glenoid fixation while at the same time reconstructing the scapular bone in cases of scapula fractures, glenoid fractures, and/or acromial fractures, and 5) provide improved rTSA joint biomechanics, particularly posterior rotator cuff efficiency by changing the line of action of the infraspinatus and teres minor muscles to improve their muscle tension, and also increase each muscle's external rotation and abduction moment arm lengths.