Metatarsophalangeal Joint Implant Curvature and Alignment Guides
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Solution Overview
Problem
Current surgical systems for replacing the metatarsophalangeal joint in hallux rigidus cases often result in limited joint motion, increased stress, and interference with the sesamoid apparatus, leading to suboptimal functional outcomes and potential complications such as toe cock-up and implant malalignment.
Innovation Solution
A surgical system comprising novel implant components and guides that allow for accurate placement and sizing of metatarsal and phalanx implants, enabling a more natural range of motion, minimal bone removal, and preservation of anatomical structures, with pre-sterilized and disposable components for improved surgical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional joint replacement arthroplasty is performed, then pain relief is achieved, but joint motion is limited and stress on the implant increases
Solution Approach 1:
The implant design changes the geometric parameters of the joint surface to match natural anatomy, with curved articular surfaces that replicate the contour of the native metatarsal head and phalanx base, thereby preserving physiological range of motion while distributing loads appropriately
2Ease of operation
If joint replacement arthroplasty is performed, then joint mobility is restored, but stress on the implant increases leading to potential failure
Solution Approach 1:
Trial implants are inserted before the final implant to pre-establish the correct joint alignment and motion characteristics. This preliminary action allows the surgeon to verify proper positioning and adjust as needed before committing to the final implant placement, ensuring optimal stress distribution from the outset
Solution Approach 2:
The implant geometry is designed with specific curvature parameters that match the natural joint, and the positioning system adjusts the implant orientation parameters to optimize load transfer through the articular surface, reducing peak stresses
3Productivity
If standardized arthroplasty technique is used, then surgical efficiency is improved, but implant malalignment and sesamoid interference occur
Solution Approach 1:
Positioning guides and alignment tools serve as intermediaries between the surgeon and the implant. These tools provide mechanical constraints that ensure accurate implant orientation and depth, preventing malalignment and sesamoid interference while maintaining surgical efficiency through standardized guide application
Solution Approach 2:
Bone cuts and preparation are performed in advance according to predetermined angles and depths using surgical guides. This preliminary preparation establishes the correct foundation for implant placement, ensuring proper alignment before the implant is inserted
4Stability of the object's composition
If excessive bone removal is performed, then implant fit is improved, but joint motion is further limited and anatomical structures are damaged
Solution Approach 1:
The implant design parameters include optimized dimensions and curvature that allow for minimal bone removal. The articular surface geometry is designed to conform to the remaining bone structure, achieving stable implant fit while preserving as much native bone and joint motion as possible
Data Source
AI summary
Disclosed are devices and related surgical methods for replacing some or all of a metatarsophalangeal joint of a patient.