Stemless Shoulder Implant Button Lock Fixation
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Solution Overview
Problem
Current arthroplasty procedures face challenges in maintaining long-term fixation of both stemless and stemmed prostheses, particularly in shoulder joints, due to issues with bone stock preservation and the need for enhanced immediate and long-term anchoring, which is crucial for revision surgeries and preventing micro-motions that hinder bone ingrowth and healing.
Innovation Solution
A prosthetic stemless shoulder implant system featuring a base member with a fixation construct comprising a flexible member connecting two fixation devices, which provides immediate mechanical stability and facilitates bone ingrowth through a combination of porous surfaces and threaded connections, allowing for secure anchoring and potential revision without significant bone removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If stemmed prostheses are used to anchor the prosthesis, then immediate fixation and structural support are improved, but healthy bone stock is removed in large amounts
Solution Approach 1:
The prosthesis is divided into a stemless base component and a separate fixation construct with buttons and sutures, eliminating the need for a traditional stemmed structure while maintaining fixation capability through distributed anchoring points
Solution Approach 2:
The base component incorporates porous surfaces that facilitate bone ingrowth and biological fixation, replacing the mechanical anchoring function of stems with biological integration, thereby preserving bone stock while achieving long-term fixation
2Loss of substance
If stemless prostheses are used to preserve bone stock, then healthy bone is removed in less amounts, but anchoring capability is reduced
Solution Approach 1:
A fixation construct comprising buttons and tensioned sutures acts as an intermediary mechanism to achieve secure anchoring of the stemless prosthesis, compensating for the reduced mechanical anchoring capability while preserving bone stock
Solution Approach 2:
The fixation mechanism transitions from rigid mechanical anchoring (stems) to a flexible tension-based system (suturing construct), changing the fixation paradigm to achieve both bone preservation and adequate anchoring strength
3Stability of the object's composition
If the fixation construct uses a flexible member connecting two fixation devices, then immediate mechanical stability is improved, but device complexity increases
Solution Approach 1:
The fixation system is segmented into modular components (base component, buttons, sutures) that can be independently positioned and adjusted, achieving stable fixation while allowing surgical flexibility in a complex anatomical environment
Data Source
AI summary
A system for shoulder repair includes a prosthetic stemless shoulder implant including a base member extending along a longitudinal axis from a first side to a second side. The second side adapted to engage bone of a patient. The base member defines a hole that extends along the longitudinal axis and through the second side of the base member for receiving a flexible member therethrough. The system includes a fixation construct including a first fixation device and a second fixation device, the first and second fixation devices connected by the flexible member. While the first fixation device is positioned outside of the second side of the base member and the second fixation device is positioned within the base member, the flexible member is adapted to tension the first fixation device with respect to the second fixation device.