Vertebral Facet Joint Prosthesis for Motion Preservation
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Solution Overview
Problem
Current surgical methods for addressing degenerative facet joints often result in loss of mobility and high morbidity, as they involve fusion of vertebrae, which is not reversible and can lead to additional complications.
Innovation Solution
A prosthesis device is designed to restore the spacing between facet joints, allowing for continued motion while minimizing bony resection, using materials like PEEK, titanium, and ceramics, and an anchoring assembly to secure the device within the joint capsule, preserving anatomical structures and reducing surgical morbidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fusion procedure is performed to address degenerative facet joints, then pain from bone-on-bone contact is eliminated, but mobility is lost and morbidity increases
Solution Approach 1:
The prosthesis acts as an intermediary device inserted into the facet joint to separate the articular surfaces and eliminate bone-on-bone contact. This mediator allows pain relief through spacing while preserving mobility by maintaining the joint's articulating function, thus resolving the contradiction between eliminating pain and preserving motion.
Solution Approach 2:
The prosthesis divides the joint space into distinct regions with its body portion, creating separation between the superior and inferior articular surfaces. This segmentation prevents direct bone contact while allowing independent motion of each facet, thereby achieving both pain relief and mobility preservation.
2Stability of the object's composition
If fusion procedure is performed, then facet joint stability is improved, but surgical morbidity and complications increase
Solution Approach 1:
The prosthesis changes the physical parameters of the joint by introducing a spacer that maintains optimal spacing between articular surfaces. This parameter change provides stability through controlled separation while avoiding the high morbidity of fusion procedures, as the joint remains functional and reversible.
Solution Approach 2:
The prosthesis design allows the joint to maintain its own stability and motion capabilities without requiring fusion to adjacent vertebrae. The device serves the joint's natural function of providing stable articulation while preserving mobility, thereby reducing surgical morbidity compared to fusion procedures.
3Reliability
If fusion procedure is performed, then facet joint function is restored, but the procedure becomes irreversible
Solution Approach 1:
The prosthesis provides a dynamic solution that allows the facet joint to maintain its natural motion and functional capabilities. Unlike irreversible fusion, this removable implant can be adjusted or taken out if needed, providing reversibility while still restoring joint function through proper spacing and articulation.
4Ease of operation
If extensive bony resection is performed to address facet degeneration, then access to joint is improved, but anatomical structures are damaged
Solution Approach 1:
The prosthesis requires only minimal preparation of the articular surfaces for insertion, avoiding extensive bony resection. This partial action approach provides sufficient access to place the spacing device while preserving the majority of anatomical structures, thus reducing damage compared to more aggressive surgical approaches.
Data Source
AI summary
Devices and methods for altering the spacing and motion at the facet joints of the vertebral column are provided. One embodiment of the invention comprises a prosthesis with surfaces configured to articulate with the facets of the facet joint. A retaining member for anchoring the prosthesis within the facet joint is optionally included. Methods for surgically and less invasively implanting the prosthesis and securing the prosthesis to the articular processes or surrounding soft tissue are also provided.